Have used Barnes MZ expanders for 20+ years and now normally spitfire TMZ for longer range performance. Both are deadly accurate. Never had an issue one if I or others using them so their job right. The only thing I have had any problem with (if you can call it that) is on elk I’ve had multiple times where the slug is under the hide in the off side, and doesn’t punch the whole way through. They’ve always been dead on their feet, but I try not to have follow up/killing shots and I like holes on both sides to let blood out. Otherwise phenomenal. FWIW this is all strictly 50 caliber experience on my end.