Mystro, you are comparing 270 Superformance loads to regular loads, but I will bite. I have a 6.5 Creedmoor and I use Hornady Superformance 129 grain interbond for hunting. A 129 grain .264 interbond has a BC of .485 (G1) and a SD of .264 compared to the 130 grain .270 interbond which has a BC of .460 (G1) and a SD of .242. The .270 has the advantage is Sectional Area (SA), but the .265 has the BC and SD advantage. You would have to shoot a 140 grain bullet SST (no interbond in that grain size) in .270 to beat the BC of the 129 grain .264, and you would have to go to 150 grain interbond to beat the SD of the 129 grain .264.
Shooting wise, the .270 130 grain superformance has a muzzle velocity of 3200 fps and the 6.5 Creedmoor 129 grain superformance has a muzzle velocity of 2950 fps. Which translates to at 500 yards:
270: velocity 2213 fps, energy of 1414 ft-lbs, and a drop of 33.70 inches
6.5 Creedmoor: velocity 2057, energy of 1212 ft-lbs, and a drop of 39.50 inches
The slight advantages that the 270 seem pretty insignificant when you consider that you are buring 10+ grains less of powder in the 6.5 Creedmoor compared to the .270. The 270 is an excellent cartridge, but it is really tough, in my opinion, to beat anything in the .264 caliber family.
Last edited by Geo_Erudite; September 16, 2013 at 11:42 AM.