The worst I ever experienced was a 458 Lott on a #1. #1's do not fit me and I only shot it once, never again. A 338-378 on a #1 wasn't much better.
Man, I heard that. I have a #1 tropical in .416 Rigby and it is a bear.
I've owned a couple of #1's in 416 rigby. I had some hot loads that were moving a 400 gn hornady along pushing 2600 fps. They were pretty uncomfortable. Still not as bad as a light weight 375 rum though.
