Well, I didn't have one cook off, but I did get some sticky bolts after some .223 rounds with H-335 rounds got hot! I have not had the problem with H-322, TAC or Big Game. I have also gotten the best accuracy ever out of my Kimber Varmint .22-250 with Big Game under 50 and 55 gr Ballistic Tips - many 3 shot groups under or at 3/8 inch.
