I've used Accubonds on deer, elk, and boar, and have NEVER had a Accubond to screw up yet-regardless of distance/retained velocity/retained energy but in all honesty the longest shot I've ever done with them was on deer at 647 yards (hobbling across my range opening day midday already wounded several times), and my last elk was 419 yards later lasered from where I shot, and to where the bull fell. I'd venture to guess a serious long shot-1,000 to 1,500 yards or more may drop them down to where they wouldn't expand reliably.