Rimfire = any rimfire handgun
Minor* = Below a power factor of 165,000 (bullet weight x speed)
Major* = Power factor of 165,000 and up
* USPSA ratings
In general, a .40 S&W should make Major
I would think that rather than reinvent the wheel we could use NRA competition rules. They have something for everyone, so we could pick the competitions for each gun and let everyone shoot. NRA does a lot of Postal Matches, and maybe we could just pick from those.