With my 338 wm i am shooting 1" groups @ 100 yds using federal trophy copper bullets. only problem is i got zero expansion as far as i could tell on two pass thrus on my elk this year-entry and exit holes appeared to be the same size. shooting core lokts i get 2" groups. typically 2 bullets real close to each other and one off a bit. is the expansion of the lead bullet in the core lokt worth the loss in accuracy when looking at 400 yd shots across canyons?