First I am not a gunwriter. Second, I've never shot a milk jug so take that into account. I think I've taken 9 elk, 5 wolves, and maybe 8 pronghorn with the 143 eld-x. Ranges have been from about 50 yards to right at about 400. I have been pretty happy with performance. I think all but 3 bullets exited. At the speed I'm shooting them (2815 fps) they perform well and shoot wonderful. The couple times that bullets did not exit I didn't recover slugs, as I didn't try. I have not shot the M version in any weight or variety. For me I wouldn't want the jacket any lighter or expansion any more rapid, so I haven't tried the M version. Lots of folks have taken plenty of game with the M though. For me the 143 eld-x has worked just fine.