tmz
I was useing tmz 250 with great sucess in a 50 extreme over 150 t7 but every once and a while they would fly. I popped plug and ran 5 rounds through the tube and one had a deformed tip from loading. I then took a pair of dykes and popped the tip off and my group quited down to about 2 inches at 100 with a lyman peep and a non stock iron front sight. I think that those bullets are very durable without the tip and the hollowpoint is about half way in diameter between the expander and the spitfire. My loading tip is most likely at fault but without the balistic tip I can run expanders ,tmz and spitfires without changing it. I have taken a plastic loading tip from a dead center pack and chucked it in a drill with a little valve grinding compound on it and spun it on the spitfire bullets that I am going to uses while hunting to make a softer plastic loader. I only spun it on a few bullets and then marked them so they would not get mixed up with my hunting loads. I am all for the durability of all copper bullets as when I pack in to hunt my gear can get banged around and for me it just takes out another variable. good luck and this website and all the quaility members will do nothing but improve your groups as they have done mine ,,,john,,,