6mm Creedmoor vs 6.5 Creedmoor: the 6mm Creedmoor is the 6.5 Creedmoor case necked down to .243 inch, so the two share the same case body, bolt face and AR10 magazine. The 6mm fires lighter 95 to 115 gr bullets faster with less recoil and a flatter path; the 6.5 fires heavier 120 to 147 gr bullets that carry more energy and suit larger game. Chattahoochee Munitions manufactures both on the CM10: the 6mm Creedmoor with an 18-inch 1:7.5 barrel at Predator Plains, and the 6.5 Creedmoor with an 18 or 24-inch 1:8 barrel at Variant Valley.
6mm Creedmoor vs 6.5 Creedmoor Specifications
| Specification | 6mm Creedmoor | 6.5 Creedmoor |
|---|---|---|
| Origin | 6.5 Creedmoor necked down; SAAMI 2017 | Hornady, 2007 |
| Bullet diameter | .243 inch | .264 inch |
| Case length | 1.920 inches | 1.920 inches |
| Typical bullets | 87 to 115 gr | 120 to 147 gr |
| Published load (24 in) | 108 gr ELD Match, 2,960 fps | 140 gr ELD Match, 2,710 fps |
| CM10 barrel | 18 inch CrMV, 1:7.5 | 18 or 24 inch 416R, 1:8 |
| CM10 magazine | 10-round Magpul PMAG LR/SR | |
Dimensions follow the ANSI/SAAMI centerfire rifle standard.
6mm Creedmoor vs 6.5 Creedmoor Ballistics
Muzzle velocities in the 24-inch rows are Hornady’s published figures. All other values are Chattahoochee Munitions calculations (published G7 BCs 0.270 and 0.326, 200-yard zero, standard atmosphere, 10 mph full-value wind; 30 fps per inch below 24 inches). They are not chronograph data.
| Load | Muzzle | 500 yd | Drop at 500 yd | Wind at 500 yd |
|---|---|---|---|---|
| 6mm CM 108 gr ELD Match, 24 in | 2,960 fps / 2,101 ft-lb | 2,133 fps / 1,091 ft-lb | -38.1 in | 15.9 in |
| 6.5 CM 140 gr ELD Match, 24 in | 2,710 fps / 2,283 ft-lb | 2,050 fps / 1,306 ft-lb | -43.8 in | 14.7 in |
| 6mm CM, 18 in CM10 (calculated) | 2,780 fps / 1,853 ft-lb | 1,984 fps / 944 ft-lb | -43.9 in | 17.5 in |
| 6.5 CM, 18 in CM10 (calculated) | 2,530 fps / 1,990 ft-lb | 1,896 fps / 1,118 ft-lb | -51.0 in | 16.2 in |
The 6mm Creedmoor drops less; the 6.5 Creedmoor’s heavier bullet carries more energy and drifts slightly less in wind. From the 18-inch CM10s, the 6mm drops about 7 inches less at 500 yards.
6mm Creedmoor vs 6.5 Creedmoor Recoil
The 6mm Creedmoor fires a bullet about 30 gr lighter on a similar powder charge, so it recoils noticeably less. In a gas-operated CM10, that makes it easier to see your own hits through the scope. The 6.5 Creedmoor is still mild by big-game standards.
6mm Creedmoor vs 6.5 Creedmoor for Hunting
- Coyotes and varmints: the 6mm Creedmoor’s flatter path and lower recoil suit predators.
- Deer and pronghorn: both, with expanding hunting bullets. The 6.5 gives more margin on larger deer and at longer range.
- Elk: Chattahoochee Munitions does not recommend the 6mm Creedmoor. See 6.5 Creedmoor for hunting, or choose 338 Federal or 375 Raptor.
- Bear: neither. Choose 458 SOCOM XL or 375 Raptor.
Barrel Life
The 6mm Creedmoor pushes a similar powder charge through a smaller bore, so throats erode faster than in a 6.5 Creedmoor. For a hunting rifle this rarely matters; for high-volume match shooting, plan for it.
6mm Creedmoor 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.
- 6mm Creedmoor (18 in CrMV, 1:7.5, 7 lb 14 oz, B5 SOPMOD stock): 6mm Creedmoor AR10, 6mm Creedmoor rifle, 6mm Creedmoor semi auto rifle
- 6.5 Creedmoor (18 or 24 in 416R, 1:8): see What is 6.5 Creedmoor? and Variant Valley
Read What is 6mm Creedmoor? and 6.5 Creedmoor ballistics.
More Predator Plains Guides
- What is 22 Creedmoor?
- 22 Creedmoor ballistics
- 22 Creedmoor twist rate
- 22 Creedmoor vs 22-250
- 22 Creedmoor vs 243
- 22 Creedmoor vs 223
- 22 Creedmoor for deer
- What is 22-250?
- 22-250 for coyotes
- 22-250 vs 223
- What is 6mm Creedmoor?
- 6mm Creedmoor vs 243 Winchester
- 6mm Creedmoor vs 6mm ARC
- What is 243 Winchester?
- 243 for deer
- 243 vs 6.5 Creedmoor
- High velocity rifle cartridges
- Predator hunting cartridges
- 22 ARC vs 22 Creedmoor
- 22 ARC vs 22-250
- 6mm ARC vs 243
6mm Creedmoor vs 6.5 Creedmoor FAQ
Is 6mm Creedmoor flatter than 6.5 Creedmoor?
Yes. With the 108 and 140 gr ELD Match loads it drops about 6 inches less at 500 yards from 24-inch barrels.
Does 6mm Creedmoor have less recoil than 6.5 Creedmoor?
Yes, because it fires a lighter bullet on a similar charge.
Is 6mm Creedmoor or 6.5 Creedmoor better for elk?
Chattahoochee Munitions does not recommend the 6mm Creedmoor for elk. The 6.5 Creedmoor has taken elk with heavy bullets at moderate range; 338 Federal gives more margin.
Do 6mm and 6.5 Creedmoor use the same magazine?
Yes. Both CM10s use a 10-round Magpul PMAG LR/SR.
Can I convert a 6.5 Creedmoor to 6mm Creedmoor?
Only with a 6mm Creedmoor barrel. Never fire one cartridge in a rifle chambered for the other.
Who makes a 6mm Creedmoor and a 6.5 Creedmoor AR10?
Chattahoochee Munitions manufactures CM10 AR10 rifles in both 6mm Creedmoor and 6.5 Creedmoor.