Re: 7 WSM in M70 short action?
I have a 300WSM in a M70 Coyote. I am definitely limited on OAL with longer bullets. I can load 165gr NAB's pretty much to the lands, but 168TTSX's need to be about 30 thou off (they shoot well here). If you need super high BC bullets for your application, and need to fit to mag length, WSM will not give you a ton of OAL flexibility. My 300WSM maxes at 2.958"
As a side note, I got into a discussion on this with a smith doing an unrelated build for me. He is wary of WSM's built on long actions with internal mags - says he has seen lots of feeding issues. Box mags work based on his experience. FWIW.