[TheErnFormerlyKnownAsBig]

I dont know if there is any other caliber besides .22 that is rimfire.

The only other I can think of is .303 that the Enfields used but I'm sure their is a million others.

[Shooter 2.5]

You're thinking about a rimmed cartridge. The rules for the .22 are for a rimfire cartridge where the primer solution is internally poured into the space inside the rim. The rules for the centerfire ammo is ball ammunition only. Nothing in this contest can be Match Ammunition.

[Jerry_M]

The .303 is a "rimmed" cartridge, but it is not rimfire. It is a centerfire. The 30-30 is another "rimmed" cartridge, but also centerfire.