As I'm trying to research my 300/338 Norma Mag build, it seems that mostly everyone says to use a large shank receiver. Is there a difference in receiver lug faces (not 100% sure what the correct terminology is) in a large shank receiver vs a small shank? If not, then why would shank size affect bolt thrust? Which seems to be the main concern stated in the forums. If the receiver lug faces are larger, I totally get it, because they look a bit thin, but if not, wouldn't shank size really be for case rupture?

Thanks!