Here's my $02 cents. Essentially any pistol cartridge firing rifle made before 1950. This would include some rare guns like Luger carbines, S&W light rifles in 9mm, Reising mode 60 carbines in 45 ACP, all the lever guns used in CAS, theoretically, a 1903 Springfield with a Pedersen device ( a rare bird but a repro could exist, or be built). The rules allow for beginners to use .22 cal (short, long, LR) firearms so the Thompson look-a-like kit on a Ruger 10/22 would be legal as would any pre-1950 style 22 cal repeater.
As the 351 Win SL is legal, the 30 carbine may be also, allowing originals and later production commercial M1 carbines as they are pre 1950 design. Ther may be more but these come to mind.