"low penetration cartridge"??!! Compared to what?!
Don't believe everything you read, Safarischorsch. Sure, there were some factory-loads with guilding-metal FMJs getting around after the second war, and the ill-informed may have blamed the cartridge rather than the bullets for low penetration, but squash a steel-jacketed solid or monolithic into the front of one of these cavernous cases, and you have all the penetration you could possibly need!

Recoil, yeah. No argument there.

500grains is right though, a quality .600 NE sidelock ejector for under $30K sounds like a fair deal to me.