Awesome pictures and stories!
In years past, I spent entire afternoons emptying 440 round tins of 7.62x54R out of Mosin carbines with bare steel buttplates with me in nothing but a T-shirt. Which is to say, I'm not particularly recoil sensitive.
My Father has a Zastava Mauser-based .458 Lott and I have fired that thing exactly once. It made an an incredibly authoritative CLANG! on a steel gong hanging at 200yd, though.
Hornady ammo was around $6 a round, if memory serves.