When I wanted a big bore.....for "just because"...I picked up a .416 Rigby.
The Rigby cartridge is a handloaders dream. Easy to load. Easy to download.
And that brings up its disadvantages.....handloading is necessary (at least for me) because the cost of factory cartridges is very high. The least expensive is still almost $5 per trigger pull.
Even brass is expensive but it is very durable and 40 cases will probably last longer than you or I if properly cared for.
"Only hunting and mountain climbing are sports. The rest are just games." - R.Ruark
NRA Life Member