Rifle Cartridge Guides — Ballistics, Comparisons & Suppressors

Rifle Cartridge Guides for Hunting

Compare cartridge designs, published factory ballistics, bullet construction, and rifle platforms. These articles connect familiar hunting calibers with the cartridge families represented throughout Chattahoochee Munitions.

Hall of Legends — 350 Legend & 400 Legend Straight Wall Cartridges

• What Is a Straight Wall Cartridge? — Case shapes, state deer rules and the rifles that fit them.
• What Is 350 Legend? — The .357-inch straight-wall deer cartridge and the 18-inch CM15.
• 350 Legend Ballistics — Velocity, energy and drop from 16 to 20-inch barrels.
• 350 Legend for Deer — Bullets, range and straight-wall rules.
• 350 Legend Suppressor — Bore rating, flow-through design and the CM15.
• What Is 400 Legend? — The .40-caliber straight-wall cartridge and the 16-inch CM15.
• 400 Legend Ballistics — Velocity, energy and drop to 300 yards.
• 400 Legend for Black Bear — Bullets, energy and shot placement.
• 400 Legend Suppressor — .40-caliber bore, flow-through design and thread pitch.
• 350 Legend vs 400 Legend — Two Winchester straight-wall cartridges compared.
• 350 Legend vs 450 Bushmaster — Lighter and flatter or heavier and wider.
• 400 Legend vs 450 Bushmaster — Energy, recoil and bullet weight compared.
• 350 Legend vs 308 — Straight-wall rules or long-range reach.
• 350 Legend vs 360 Buckhammer — AR15 or lever action for straight-wall deer.
• 350 Legend vs 30-30 — Two deer-hunting cartridges compared through specific factory loads.
• 400 Legend vs 44 Magnum — Modern straight-wall performance alongside an established lever-action hunting caliber.
• 300 Blackout vs 350 Legend — Subsonic .30 caliber against a straight-wall deer cartridge.

Explore Hall of Legends rifles and magazines →

Variant Valley — 6.5 Creedmoor, 7mm-08, 338 Federal & 358 Winchester

• What Is 6.5 Creedmoor? — Specifications, history, factory loads and the 18 and 24-inch CM10.
• 6.5 Creedmoor Ballistics — Drop, energy and wind from 18 and 24-inch barrels.
• 6.5 Creedmoor Barrel Length — 18 or 24 inches: velocity, weight and handling.
• 6.5 Creedmoor Twist Rate — Why every CM10 6.5 Creedmoor barrel is 1:8.
• 6.5 Creedmoor for Hunting — Deer, elk, hogs and where the cartridge stops.
• 7mm-08 vs 6.5 Creedmoor — Two short-action hunting cartridges compared.
• What Is 7mm-08? — The 308 case necked down to 7 mm, and the CM10 7mm-08.
• 7mm-08 vs 308 — The necked-down offspring against its parent.
• What Is 338 Federal? — The 308 case necked up to .338 for elk and black bear.
• 338 Federal vs 308 — Same case, bigger bullet: energy, trajectory and recoil.
• 338 Federal vs 8.6 Blackout — Supersonic .338 AR10 or subsonic-capable .338.
• What Is 358 Winchester? — The 1955 big-bore woods cartridge on the 308 case.
• 308 Winchester Cartridge Family — How one case became 6.5 Creedmoor, 7mm-08, 338 Federal and 358 Winchester.
• 338 Federal vs 358 Winchester, Including 7mm-08 — Energy, trajectory, recoil and game from deer to elk.

Explore Variant Valley CM10 rifles →

District 308 — 308 Winchester

• What Is 308 Winchester? — Specifications, history, supersonic and subsonic loads, and the CM7S and CM10.
• 308 Winchester Subsonic — CM’s 300 gr load, the 1:5 twist and CM10-SD cycling.
• 308 Ballistics — Published supersonic charts and CM’s 300 gr subsonic range card.
• 308 Twist Rate — 1:12, 1:10, 1:8 and 1:5, with calculated stability.
• 308 Barrel Length — 12.5, 16 or 18 inches, supersonic and subsonic.
• 308 for Hunting — Deer, hogs and elk, and close-range suppressed subsonic.
• 308 Bolt Action vs Semi Auto — The CM7S or the CM10.
• 308 Suppressor Guide — Flow-through for supersonic CM10, enclosed for the CM10-SD and CM7S.
• 308 Winchester vs 7.62 NATO — Cartridge designations, technical differences, and firearm-specific compatibility.
• 308 vs 6.5 Creedmoor — Bullet weight, wind drift, recoil and subsonic.
• 308 vs 30-06 — Short action or long action with the same .308 bullets.

Explore District 308 bolt actions, AR10 rifles and subsonic ammunition →

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Predator & Precision Rifle Cartridge Guides

Explore high-velocity cartridges, external ballistics, and the differences between bolt-action and semi-automatic platforms. Start with a broad overview, then follow the cartridge comparisons and platform guides that match your interests.

Predator Plains — 22 Creedmoor, 22-250, 6mm Creedmoor & 243 Winchester

• What Is 22 Creedmoor? — The 6.5 Creedmoor case necked to .224 for heavy bullets, and the 22-inch CM10.
• 22 Creedmoor Ballistics — Drop, energy and wind to 600 yards from the 22-inch CM10.
• 22 Creedmoor Twist Rate — Why every CM10 22 Creedmoor barrel is 1:8.
• 22 Creedmoor vs 22-250 — Heavy bullets or light and fast.
• 22 Creedmoor vs 243 — Two short-action predator cartridges compared.
• 22 Creedmoor vs 223 — AR10 .224 or AR15 .224, and the .223 and 5.56 NATO difference.
• 22 Creedmoor for Deer — Why Chattahoochee Munitions points deer hunters to the 243 or 6mm Creedmoor.
• What Is 22-250? — The classic .224 varmint and coyote cartridge, and the 20-inch CM10.
• 22-250 for Coyotes — Bullets, trajectory and wind.
• 22-250 vs 223 — How much more speed for coyotes and varmints.
• What Is 6mm Creedmoor? — The 6.5 Creedmoor case necked to .243, and the 18-inch CM10.
• 6mm Creedmoor vs 243 Winchester — Two .243 cartridges compared.
• 6mm Creedmoor vs 6.5 Creedmoor — Same case, different bullets.
• 6mm Creedmoor vs 6mm ARC — AR10 or AR15 for the same bullet.
• What Is 243 Winchester? — The 308 case necked to .243 for deer and varmints.
• 243 for Deer — Bullets, range and shot placement.
• 243 vs 6.5 Creedmoor — Light and fast or heavy and efficient.
• Predator Hunting Cartridges — Six cartridges examined across CM7S, CM10 and CM15 platforms.
• High Velocity Rifle Cartridges — Velocity, ballistic coefficient, trajectory and wind drift.

Explore Predator Plains CM10 rifles →

Flight Deck 22 — 22 ARC

• 22 ARC Rifle Guide — The CM15 AR15 and the CM7S bolt action compared.
• 22 ARC Ballistics — Calculated drop, drift and energy by barrel length.
• 22 ARC Twist Rate — 1:7 on the CM15, 1:8 on the CM7S, and 88-grain bullets.
• 22 ARC for Deer — Legality, bullet selection and range.
• 22 ARC for Coyotes and Hogs — Bullets, barrels and platforms for predators and hogs.
• 22 ARC Suppressor Guide — Flow-through on the CM15, enclosed on the CM7S.
• 22 ARC vs 223 — Heavier .224 bullets on the same AR15 lower.
• 22 ARC vs 22 Creedmoor — An AR15 cartridge or a short-action one.
• 22 ARC vs 22-250 — A modern .224 against the traditional varmint cartridge.
• 22 ARC vs 6mm ARC — Same case head, different bullets.

Explore Flight Deck 22 rifles, uppers and magazines →

Overwatch 6 — 6mm ARC

• What Is 6mm ARC? — Specs, history, uses and limits.
• 6mm ARC Rifle Guide — The CM7S bolt action and the CM15 AR15 compared.
• 6mm ARC Ballistics — Published and calculated drop, energy and wind by barrel length.
• 6mm ARC Twist Rate — Why every CM barrel is 1:7.
• 6mm ARC Barrel Length — 12.5, 16 or 18 inches.
• 6mm ARC Bolt Action vs Semi Auto — CM7S or CM15 by use.
• 6mm ARC for Deer — Bullets, range and shot placement.
• 6mm ARC for Coyotes and Hogs — Bullets, wind and shot placement.
• 6mm ARC Suppressor Guide — Enclosed on the CM7S, flow-through on the CM15.
• 5.56 Suppressor Guide — Flow-through on the CM15, bore and barrel-length ratings, short-barrel hosts.
• 6mm ARC vs 223 — Heavier .243 bullets on the same AR15 lower.
• 6mm ARC vs 6.5 Creedmoor — AR15 size or AR10 reach.
• 6mm ARC vs 243 — The same bullet diameter in a much smaller case.

Explore Overwatch 6 rifles, uppers and magazines →

Grendel’s Lair — 6.5 Grendel

• 6.5 Grendel Guide — Cartridge history, ballistics, uses and the CM7S and CM15.
• 6.5 Grendel Ballistics — Velocity, energy, drop and effective range.
• 6.5 Grendel Twist Rate — 1:7 vs 1:8 and matching bullet weight.
• 6.5 Grendel Barrel Length — 12.5, 16, 18 and 20-inch barrels compared.
• 6.5 Grendel for Deer — Bullet selection, range and barrel length.
• 6.5 Grendel for Coyotes and Hogs — Bullets, barrels and platforms for predators and hogs.
• 6.5 Grendel Suppressor Guide — Flow-through on the CM15, enclosed on the CM7S.
• 6.5 Grendel Bolt Action vs Semi Auto — The CM7S or the CM15.
• 6.5 Grendel vs 5.56 — Energy and reach on the same AR15 lower.
• 6.5 Grendel vs 6.5 Creedmoor — An AR15 cartridge or an AR10 cartridge.
• 6.5 Grendel vs 308 — Energy, recoil and rifle size compared.
• 6.5 Grendel vs 6mm ARC — Same case head, different bullets.
• 6.5 Grendel vs 6.8 SPC — Bolts, magazines and ballistics.
• 338 ARC vs 6.5 Grendel — Same case head, different jobs.

Explore Grendel’s Lair rifles, uppers and magazines →

Garrison 5.56 — 5.56 NATO

• What Is 5.56 NATO? — The 5.56x45mm (556) cartridge, the .223 chamber rule and the CM15 lineup.
• 5.56 vs 223 — Same case, different chamber and pressure, and which ammunition is safe where.
• 5.56 vs 308 — AR15 speed or AR10 energy.
• 5.56 Ballistics — Drop, energy and wind for 55, 62 and 77 gr loads and short barrels.
• 5.56 Barrel Length — Velocity, blast and handling from 8 to 16 inches.
• 5.56 Twist Rate — 1:7 or 1:8 for 55 to 77 gr bullets.
• 5.56 for Deer — Why to consider a larger AR15 cartridge for deer.
• 5.56 for Coyotes and Hogs — Bullets, range and barrel length.
• 5.56 for Home Defense — Barrel length, ammunition, walls, and when to consider 300 Blackout subsonic.

Explore Garrison 5.56 rifles, pistols and uppers →

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Short-Barrel Subsonic Cartridge Guides

These guides cover cartridges designed around heavy subsonic bullets, short barrels and suppressors, with the twist rates, barrel lengths and platforms Chattahoochee Munitions manufactures for each.

The Raptor Paddock — 375 Raptor

• 375 Raptor Subsonic — Heavy bullets, short barrels and suppressed performance.
• 375 Raptor Ballistics — Subsonic and supersonic velocity, energy and drop.
• 375 Raptor Twist Rate — Why 1:8 for heavy subsonic bullets.
• 375 Raptor Barrel Length — 12.5 inch vs 16 inch for subsonic and supersonic.
• 375 Raptor Hunting — Suppressed deer, hog and black bear.
• 375 Raptor Suppressor Guide — Suppressor dimensions, mounting and the CM PLACID .375.
• 375 Raptor Bolt Action vs Semi-Auto — The CM7S or the CM10.
• 375 Raptor vs 338 ARC — Heavy subsonic in an AR10 or an AR15.
• 375 Raptor vs 8.6 Blackout — Two short-barrel subsonic cartridges compared.

Explore The Raptor Paddock 375 Raptor rifles and ammunition →

Terminal 458 — 458 SOCOM and 458 SOCOM XL

• What Is 458 SOCOM XL? — Longer projectiles and more case capacity beyond the AR15.
• 458 SOCOM Subsonic — Heavy projectiles, the XL configuration, and the CM7S and center-feed CM10.
• 458 SOCOM Ballistics — 650 gr velocity, energy and drop chart.
• 458 SOCOM Effective Range — 650 gr subsonic drop, energy and holds.
• 458 SOCOM Twist Rate — Why 1:10 for 650 gr subsonic.
• 458 SOCOM Barrel Length — 12.5 inch vs 16 inch for subsonic.
• 458 SOCOM Hunting — Hogs, deer and black bear with 650 gr subsonic.
• 458 SOCOM for Bear — 650 gr XL for black, brown and grizzly bear.
• 458 SOCOM Suppressor Guide — Enclosed suppressors and the PLACID OTB.
• 458 SOCOM Bolt Action vs Semi Auto — The CM7S or the CM10.
• 458 SOCOM vs 450 Bushmaster — 650 gr XL vs 395 gr Sub-X subsonic.
• 458 SOCOM vs 45-70 — The same .458 bullet in different cartridges.

Explore Terminal 458 rifles, magazines and ammunition →

Area 8.6 — 8.6 Blackout

• What Is 8.6 Blackout? — SAAMI specifications, the 6.5 Creedmoor parent case, and the CM7S and CM10.
• 8.6 Blackout Subsonic — Barrel length, twist rate and suppressor guidance.
• 8.6 Blackout Ammo — Published subsonic and supersonic loads matched to twist rate.
• 8.6 Blackout Ballistics — Published velocity and energy by barrel length.
• 8.6 Blackout Twist Rate — When to choose a 1:3 or 1:5 twist.
• 8.6 Blackout Barrel Length — 8, 12.5 and 16-inch barrels compared.
• 8.6 Blackout Hunting — Hogs and deer with heavy subsonic and supersonic bullets.
• 8.6 Blackout Suppressor — Caliber rating, enclosed or flow-through.
• 8.6 Blackout Bolt Action vs Semi Auto — The CM7S or the CM10.
• 8.6 Blackout vs 300 Blackout — Subsonic bullet weight, energy and platform size.
• 8.6 Blackout vs 308 — Subsonic, supersonic and twist compared.
• 8.6 Blackout vs 458 SOCOM — Two heavy subsonic big bores.
• 338 ARC vs 8.6 Blackout — AR15 or AR10 for .338 subsonic.

Explore Area 8.6 rifles, pistols, SBRs and barreled actions →

Containment Zone 338 — 338 ARC

• 338 ARC Subsonic — Cartridge characteristics and the CM7S and CM15.
• 338 ARC Ballistics — Subsonic and supersonic velocity and energy.
• 338 ARC Twist Rate — Why 1:6 and 1:5 for subsonic bullets.
• 338 ARC Barrel Length — 8 to 16 inches for subsonic and supersonic.
• 338 ARC Hunting — Deer and hogs, subsonic or supersonic.
• 338 ARC Suppressor Guide — Enclosed or flow-through, bolt action or AR15.
• 338 ARC Bolt Action vs Semi Auto — The CM7S or the CM15 for subsonic.
• 338 ARC vs 300 Blackout — Subsonic energy, parts and ammunition.
• 338 ARC vs 6.5 Grendel — Same case head, different jobs.
• 338 ARC vs 8.6 Blackout — AR15 or AR10 for .338 subsonic.

Explore Containment Zone 338 rifles, uppers and magazines →

Sector 300 — 300 Blackout

• What Is 300 Blackout? — SAAMI specifications, subsonic and supersonic loads, and the CM15 and CM7S.
• 300 Blackout Subsonic — 1:5 barrels, enclosed suppressors and AR15 cycling.
• 300 Blackout Ballistics — Calculated subsonic and supersonic drop, wind and energy.
• 300 Blackout Twist Rate — 1:5 for heavy subsonic bullets, 1:7 on the 16-inch CM15.
• 300 Blackout Barrel Length — 5 to 16 inches, and why CM recommends 10 to 10.5.
• 300 Blackout Gas System — Pistol-length gas, the adjustable gas block and buffer tuning.
• 300 Blackout Hunting — Deer and hogs, subsonic or supersonic.
• 300 Blackout Suppressor — Enclosed or flow-through, bolt action or AR15.
• 300 Blackout Bolt Action vs Semi Auto — The CM7S or the CM15 for subsonic.
• 300 Blackout vs 308 — Subsonic 208 gr against CM 308 subsonic, and supersonic range.
• 300 Blackout vs 7.62×39 — Two .30-caliber intermediates in an AR15.
• 300 Blackout vs 350 Legend — 190 gr vs 250 gr Sub-X subsonic, and straight-wall rules.

Explore Sector 300 pistols, SBRs, rifles, uppers and bolt actions →

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Subsonic Rifle Cartridge Guides

Subsonic ammunition places particular demands on projectile stabilization and firearm operation. These rifle cartridge guides explain caliber-specific considerations and distinguish specialized CM configurations from conventional rifles chambered for the same cartridge.

• 458 SOCOM Subsonic — Heavy projectiles, the XL configuration, and CM7S and center-feed CM10 platforms.
• 8.6 Blackout Subsonic — 1:3 or 1:5 twist, 12.5-inch barrels, and enclosed suppressors on the CM7S and CM10.
• 300 Blackout Subsonic — 1:5 barrels, enclosed suppressors, and CM15 and CM7S platform differences.
• 308 Winchester Subsonic — CM’s 300-grain ammunition, its 1:5 twist requirement, and CM10-SD cycling with an enclosed suppressor.
• 308 Twist Rate — Why CM’s 300 gr subsonic load needs a 1:5 twist.
• 338 ARC Subsonic — Cartridge characteristics and CM’s bolt-action and AR15-platform configurations.

Follow each guide to its corresponding caliber hub for the complete firearms, ammunition, and supporting components offered by CM.

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Suppressors & Operating Systems

Suppressor selection depends on the cartridge, ammunition, and operating platform. These articles complement our rifle cartridge guides by explaining why the requirements of a manually operated rifle can differ from those of a gas-operated semi-automatic system.

• Reflex Suppressor — How an over the barrel design works, and the titanium PLACID OTB.
• Direct Thread vs HUB Mount — How each mount attaches, changing hosts, and the PLACID 375.
• Titanium vs Stainless Suppressor — Weight, heat and service, with the PLACID OTB and PLACID 375.
• Suppressed Bolt Action Rifle — 375 Raptor and 458 SOCOM XL subsonic in the CM7S with PLACID OTB.
• 375 Raptor Suppressor Guide — Suppressor dimensions, mounting considerations, and the CM PLACID .375.
• 8.6 Blackout Suppressor Guide — Enclosed or flow-through for the CM7S bolt action and the CM10 AR10.
• 458 SOCOM Suppressor Guide — Enclosed suppressors for 650 gr subsonic and the PLACID OTB.
• 338 ARC Suppressor Guide — Enclosed or flow-through for the CM7S bolt action and the CM15 AR15.
• 300 Blackout Suppressor Guide — Enclosed for subsonic, flow-through for supersonic on the CM15, enclosed on the CM7S.
• 6.5 Grendel Suppressor Guide — Flow-through on the CM15, enclosed on the CM7S.
• 308 Suppressor Guide — Flow-through and enclosed suppressors across conventional and specialized CM configurations.
• 6mm ARC Suppressor Guide — Enclosed on the CM7S bolt action, flow-through on the CM15.
• 300 Blackout Gas System Guide — Gas-system configuration, suppressor behavior, and semi-automatic operation.

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Explore Rifle Cartridge Guides by Caliber Hub

Each caliber hub brings related firearms, magazines, ammunition where offered, and educational articles into one destination. Use this directory to move from rifle cartridge guides to the corresponding CM product family.

• The Raptor Paddock — 375 Raptor.
• Terminal 458 — 458 SOCOM and 458 SOCOM XL.
• Area 8.6 — 8.6 Blackout.
• Sector 300 — 300 Blackout.
• Containment Zone 338 — 338 ARC.
• Grendel’s Lair — 6.5 Grendel.
• District 308 — 308 Winchester.
• Flight Deck 22 — 22 ARC.
• Overwatch 6 — 6mm ARC.
• Predator Plains — 22 Creedmoor, 22-250 Remington, 6mm Creedmoor, and 243 Winchester.
• Variant Valley — 338 Federal, 358 Winchester, and 7mm-08 Remington.
• Hall of Legends — 350 Legend and 400 Legend.
• Garrison 5.56 — 5.56 NATO.
• PLACID Suppression — PLACID OTB and PLACID 375 suppressors for 375 Raptor and 458 SOCOM XL.

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About Our Rifle Cartridge Guides

Chattahoochee Munitions manufactures complete firearms across the CM7S, CM10, and CM15 platforms. Our articles connect cartridge information with the configurations CM offers, helping readers understand ammunition selection, barrel specifications, magazine requirements, and suppressor considerations.

CM testing, published manufacturer data, and general technical explanations serve different purposes. Read the stated load, barrel configuration, and test conditions alongside any performance figure. A result from one firearm or ammunition combination should be evaluated in that context.

For commercial cartridge and chamber standards, the Sporting Arms and Ammunition Manufacturers’ Institute provides an industry reference. For demonstrations of CM firearms, visit our Field Testing page.

Return to our rifle cartridge guides as the article library grows, or choose a caliber hub above to explore the rifles and supporting products associated with your cartridge.

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