I've got several. In order of decreasing power at max load: A .416 Rigby on a CZ action, a nitro .50-110 on an 1886 action, a .375 H&H MRC 1999, a nitro .45-90 1885 (largely unusable due to recoil), and a nitro .45-90 1886. Plus a few pistol cartridge lever guns that are technically big bores but don't really count.
