308 vs 6.5 Creedmoor comes down to bullet weight against wind resistance. The 308 Winchester fires heavier .30-caliber bullets, carries more energy inside about 600 yards, and is the only one of the two with a practical heavy subsonic load. The 6.5 Creedmoor fires lighter, higher-ballistic-coefficient bullets that drift less in the wind and recoil less. Chattahoochee Munitions manufactures both: 308 Winchester as the CM7S bolt action and CM10 AR10, including 1:5 twist subsonic configurations, and 6.5 Creedmoor as the CM10 AR10 in 18 and 24 inches.
308 vs 6.5 Creedmoor at a Glance
| 308 Winchester | 6.5 Creedmoor | |
|---|---|---|
| Introduced | 1952 | 2007 |
| Bullet diameter | .308 inch | .264 inch |
| Common bullet weights | 150 to 178 gr supersonic; 300 gr subsonic | 120 to 147 gr |
| Action | Short action, AR10 | Short action, AR10 |
| Practical subsonic load | Yes, with a 1:5 twist (CM 300 gr) | Not offered by CM |
| Chattahoochee Munitions firearms | CM7S 12.5 and 16 inch, CM10 12.5, 16 and 18 inch, CM10-SD | CM10 18 and 24 inch |
Both cartridges fit the same short actions and AR10 receivers. Dimensions for each are published in the ANSI/SAAMI centerfire rifle standard.
308 vs 6.5 Creedmoor Ballistics
Published factory figures, 24-inch test barrels, 200-yard zero. Trajectory in inches.
| Load (Hornady published) | Muzzle | 300 yd | 500 yd |
|---|---|---|---|
| 308 Win 168 gr ELD Match | 2,700 fps, 2,719 ft-lb | 2,209 fps, 1,820 ft-lb, −8.2 in | 1,912 fps, 1,364 ft-lb, −47.1 in |
| 6.5 Creedmoor 140 gr ELD Match | 2,710 fps, 2,283 ft-lb | 2,285 fps, 1,622 ft-lb, −7.8 in | 2,023 fps, 1,273 ft-lb, −44.4 in |
| 308 Win 178 gr ELD-X | 2,600 fps, 2,671 ft-lb | 2,145 fps, 1,818 ft-lb, −8.8 in | 1,868 fps, 1,379 ft-lb, −50.2 in |
| 6.5 Creedmoor 143 gr ELD-X | 2,700 fps, 2,315 ft-lb | 2,282 fps, 1,654 ft-lb, −7.9 in | 2,025 fps, 1,302 ft-lb, −44.5 in |
Inside 500 yards the drop is within about 3 to 6 inches between matched loads, and the 308 carries more energy. The 6.5 Creedmoor’s advantage shows up in the wind and farther out.
Wind Drift and Long Range
Chattahoochee Munitions calculation (G1 BCs fitted to the published tables, standard atmosphere, 10 mph full-value crosswind):
| Load | 500 yd | 800 yd | 1,000 yd |
|---|---|---|---|
| 308 Win 168 gr ELD Match | 18.5 in | 52.9 in | 88.9 in |
| 6.5 Creedmoor 140 gr ELD Match | 15.4 in | 43.2 in | 71.9 in |
At 1,000 yards the 6.5 Creedmoor drifts about 17 inches less and drops about 36 inches less in this calculation, and by 800 yards it also carries slightly more energy. These are calculated values, not test results.
308 vs 6.5 Creedmoor Recoil
The 6.5 Creedmoor launches a lighter bullet at a similar speed, so it recoils noticeably less in rifles of the same weight. That helps shooters see their own impacts through the scope and makes long strings of fire easier. The 308 recoils more but stays manageable in a rifle of normal weight, and a suppressor reduces felt recoil on either cartridge.
308 vs 6.5 Creedmoor for Hunting
Both are proven deer and elk cartridges at practical ranges with good bullets and shot placement. The 308 Winchester’s heavier bullets carry more energy and momentum inside typical hunting distances, which many hunters prefer for elk. The 6.5 Creedmoor’s flatter, less wind-sensitive flight helps on longer open-country shots. See 308 for hunting.
308 vs 6.5 Creedmoor Subsonic
This is where the two differ most for suppressed shooting. A .30-caliber bore can launch a 300 gr bullet that still carries 673 ft-lb at 1,005 fps, which is why Chattahoochee Munitions loads 308 subsonic ammo with a 300 gr Maker REX expanding bullet and designs the 1:5 twist CM7S 12.5-inch and CM10-SD around it. The smaller 6.5 mm bore cannot carry as much bullet weight at subsonic speed, and Chattahoochee Munitions does not offer a subsonic 6.5 Creedmoor. If quiet, suppressed shooting matters, choose the 308. See 308 Winchester subsonic.
Barrel Life, Ammunition and Platforms
The 308 Winchester has more factory loads and military-pattern 7.62×51 NATO ammunition available, and it generally gives longer barrel life than the 6.5 Creedmoor. The 6.5 Creedmoor offers a wide range of match and hunting loads with high-BC bullets. Both run in short-action bolt rifles and AR10 rifles.
Which Should You Choose?
- Choose 308 Winchester for heavier bullets, more energy inside typical hunting ranges, wide ammunition availability, and a practical suppressed subsonic option.
- Choose 6.5 Creedmoor for less recoil and less wind drift at long range.
308 and 6.5 Creedmoor Firearms From Chattahoochee Munitions
- 308 bolt action: CM7S 308 bolt action rifle, 16 inch, CM7S 308 subsonic bolt action, 12.5 inch
- 308 AR10: CM10 308 AR10 rifle, 16 inch, CM10 308 long range AR10, 18 inch, CM10-SD 308 subsonic AR10
- 6.5 Creedmoor AR10, 18 inch: CM10 6.5 Creedmoor AR10, 18 inch, CM10 6.5 Creedmoor semi auto rifle, 18 inch, CM10 6.5 Creedmoor hunting rifle, 18 inch
- 6.5 Creedmoor AR10, 24 inch fluted: CM10 6.5 Creedmoor long range rifle, 24 inch, CM10 6.5 Creedmoor precision rifle, 24 inch
Also see 6.5 Grendel vs 6.5 Creedmoor, What Is 6.5 Creedmoor?, 6.5 Creedmoor ballistics and 7mm-08 vs 6.5 Creedmoor. Every 308 configuration is in District 308, and every 6.5 Creedmoor CM10 is in Variant Valley with the other 308 based cartridges.
308 vs 6.5 Creedmoor FAQ
Is 6.5 Creedmoor better than 308?
For long-range wind drift and recoil, the 6.5 Creedmoor has the edge. For energy inside about 600 yards, barrel life, ammunition variety and subsonic use, the 308 Winchester does.
Which hits harder, 308 or 6.5 Creedmoor?
The 308 carries more energy inside about 600 yards with typical loads. Farther out, high-BC 6.5 Creedmoor loads retain slightly more.
Is 6.5 Creedmoor flatter than 308?
Slightly at 500 yards and clearly at 1,000 yards, where it drops about 36 inches less in the calculation above.
Is 308 or 6.5 Creedmoor better for elk?
Both work at practical ranges with good bullets. Many hunters prefer the heavier 308 bullets for elk.
Can you shoot subsonic 6.5 Creedmoor?
Some loads exist, but the small bore limits bullet weight. Chattahoochee Munitions offers subsonic in 308 Winchester, not 6.5 Creedmoor.
Do 308 and 6.5 Creedmoor use the same magazines?
They use the same short-action and AR10 magazine patterns in many firearms. Use the magazine the firearm maker specifies.
Who makes 308 and 6.5 Creedmoor rifles?
Chattahoochee Munitions manufactures 308 Winchester rifles (the CM7S bolt action and the CM10 AR10, including 1:5 subsonic configurations) and the CM10 6.5 Creedmoor AR10 in 18 and 24 inches.