I use only Woodleigh's on big game, my experiences include using .338W, 9.3x62 & 416Taylor on large feral animals (buff, bulls, brumbies & donkeys). With each cartridge the weldcores expand rapidly while maintaining integrity to deliver a hammer blow with deep penetration. The FMJ Woodleigh's have also worked flawlessly for me. I plan to trial the newer Hydros next trip....