I`ve only killed three deer with Bergers, all with 7mm bullets. Two from 7 Mags, a 168 grn and a 180 grn, both these bullets came apart inside the animals, as advertized, leaving several exit holes, and DRT, the third with the 7x57 and a 140 grner. Only recovered the 140, which had expanded back to the boat tail. That animal went about 40 yrds. All shots were about 200 yrds.
MD suggest trying a bullet out on at least 6?, animals before coming to any conclusion. A few more to go for me, but so far so good.