I've built an AR for my son in 6.8SPC and he's taken 2 deer with it. 16" barrel and M4 stock, makes it ideal for youth. But, its darn fun to shoot too. I know its not the 6.5, but they are both so close within 300 yards. I find the recoil almost non-existent really. My son was able to stay on the glass and make a quick follow up shot on his first deer when he was 10. That right there paid for itself, becuase I doubt a 10 year old could have been able to quickly bolt another round with something like a 308, creedmoor, 7mm-08, 243..