505 was a beast of a cartridge in physical size. My favourite brit cartridge though is the .425 WR! Is a dream gun of mine. I think it was Huvius who sold one exactly how i want.. 28" barrel, extended magazine.

As for the above.. .300 has that sexy slope, .375 has that nice taper.. Never been a fan of hte Rigby's shape, .404 is again a nice shape.. I'll lock in .375.