Greg, the little 375 winchester, using 255 grain Barnes 0riginals will expand very well at 200 yds and within. I never found the strengthened big bore receiver to be necessary for the little 375. We only ever used cheap rebored 30-30's.
I used slower RL 10x @ 1870 fps for lower pressure.

Quartering towards shot at about 150-175 yd. Bullet hit fat bull caribou head on. Nicked the vertebrae, and brisket bone. It never touched the from quarters, went right between them. Hide caught bullet on the offside. That pure copper jacketed Barnes 0 is a darn good lever gun bullet at lower velocity.
[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]