243 vs 6.5 Creedmoor: Light and Fast or Heavy and Efficient

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243 vs 6.5 Creedmoor: the 243 Winchester fires lighter 55 to 105 gr .243 bullets fast from a 308-based case, and covers varmints through deer with very light recoil. The 6.5 Creedmoor fires heavier 120 to 147 gr .264 bullets with high ballistic coefficients that carry more energy and resist wind past 400 yards. Choose the 243 for predators, varmints and deer at normal ranges; choose the 6.5 Creedmoor for longer shots and larger deer. Chattahoochee Munitions manufactures both on the CM10: the 243 at Predator Plains and the 6.5 Creedmoor at Variant Valley.

243 vs 6.5 Creedmoor Specifications

Specification 243 Winchester 6.5 Creedmoor
Introduced 1955, Winchester 2007, Hornady
Parent case 308 Winchester .30 Thompson/Center
Bullet diameter .243 inch .264 inch
Case length 2.045 inches 1.920 inches
Typical bullets 55 to 105 gr 120 to 147 gr
CM10 barrel 20 inch, 1:8 (416R) or 1:10 (CrMV) 18 or 24 inch 416R, 1:8

Dimensions follow the ANSI/SAAMI centerfire rifle standard.

243 vs 6.5 Creedmoor Ballistics

Muzzle velocities are Hornady’s published figures from 24-inch barrels (243 90 gr ELD-X at 3,150 fps; 6.5 Creedmoor 140 gr ELD Match at 2,710 fps). Downrange values and the CM10 rows are Chattahoochee Munitions calculations (200-yard zero, standard atmosphere, 10 mph full-value wind; 30 fps per inch below 24 inches). They are not chronograph data.

Load Muzzle 300 yd 500 yd Drop at 500 yd Wind at 500 yd
243 90 gr ELD-X, 20 in CM10 3,030 fps / 1,835 ft-lb 2,362 fps / 1,115 ft-lb 1,967 fps / 773 ft-lb -40.2 in 21.1 in
6.5 CM 140 gr ELD Match, 18 in CM10 2,530 fps / 1,990 ft-lb 2,137 fps / 1,420 ft-lb 1,896 fps / 1,118 ft-lb -51.0 in 16.2 in
6.5 CM 140 gr ELD Match, 24 in CM10 2,710 fps / 2,283 ft-lb 2,301 fps / 1,646 ft-lb 2,050 fps / 1,306 ft-lb -43.8 in 14.7 in

The 243 drops less to 500 yards from these barrels. The 6.5 Creedmoor carries 45 to 70 percent more energy at 500 yards and drifts 5 to 6 inches less in the wind.

243 vs 6.5 Creedmoor Recoil

The 243 fires a bullet about 50 gr lighter, so it recoils noticeably less. Both are comfortable in a CM10, which uses a gas system and an adjustable buffer.

243 vs 6.5 Creedmoor for Hunting

  • Coyotes, foxes and varmints: the 243 with light, fast bullets. The 6.5 works but has more bullet than predators need.
  • Deer and pronghorn: both. The 243 with 90 to 100 gr bullets at normal ranges; the 6.5 Creedmoor at longer range or on larger deer. Read 243 for deer and 6.5 Creedmoor for hunting.
  • Hogs: both, with controlled-expansion bullets.
  • Elk: Chattahoochee Munitions does not recommend the 243. Choose 338 Federal or 375 Raptor.
  • Bear: neither. Choose 458 SOCOM XL or 375 Raptor.

243 vs 6.5 Creedmoor CM10 Rifles

Both CM10s use billet 7075-T6 receivers, rifle-length gas, a .750-inch Superlative Arms adjustable gas block, a TriggerTech Duty trigger and a 10-round Magpul PMAG LR/SR.

Also read What is 243 Winchester?, 6mm Creedmoor vs 6.5 Creedmoor and 308 vs 6.5 Creedmoor.

More Predator Plains Guides

243 vs 6.5 Creedmoor FAQ

Is 243 flatter than 6.5 Creedmoor?

To 500 yards, yes, with the loads and barrels compared here. The 6.5 Creedmoor drifts less in wind and carries more energy.

Is 243 or 6.5 Creedmoor better for deer?

Both work. The 243 suits normal ranges with light recoil; the 6.5 Creedmoor gives more margin at distance and on larger deer.

Which has less recoil, 243 or 6.5 Creedmoor?

The 243, because it fires a lighter bullet.

Is 243 or 6.5 Creedmoor better for coyotes?

The 243, with light, fast varmint bullets.

Can a 243 kill elk?

Chattahoochee Munitions does not recommend the 243 for elk. Choose 338 Federal or 375 Raptor.

Who makes a 243 AR10 and a 6.5 Creedmoor AR10?

Chattahoochee Munitions manufactures CM10 AR10 rifles in both 243 Winchester and 6.5 Creedmoor.

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