Welcome ,
Sorry I'm not familiar enough with the .375 or PRC to answer your question but wanted to wish you a welcome here.
You may get a better response on your build if the questions are posted in one of the more specific forums like the centerfire rifle forum in the 110 section. That's where someone with similar interest in the same type setup may be more likely to see your question if you use a descriptive title for your post.
Good luck