Dear Tony:
Oh, traditionally we have quite a few of active bullseye participants where I live (Germany). The shooting associations most of us belong to offer different match categories specifically for the various handgun types and calibers on the market.
Routinely I enter matches in the following 25 meter disciplines offered by German shooting association Bund Deutscher Sportschuetzen / Bund Bayerischer Schuetzen e.V.:
- "Centerfire Pistol cal. 9 mm/.38" (most logical caliber is 9 mm Luger, but you may also enter with a .38 Super, 9x21 IMI, 9x23, 9x25, ...);
- "Centerfire Pistol larger than cal. 9 mm/.38" (eligible calibers .45 ACP, 10 mm Auto, .40 S&W and others);
- "Rimfire Pistol/Revolver cal. 5,6 mm/.22 w/Open Sights" (self-explanatory);
- "Centerfire Revolver cal. .38"; (nearly everybody shots .38 Special);
- "Centerfire Revolver over cal. .38" (most popular calibers are .45 "long" Colt and .44 S.&.W. Special);
- "Centerfire Revolver Magnum cal. .357" (= .357 Magnum);
- "Centerfire Revolver Magnum over cal. .357" (= .44 Mag., .41 Mag., .454 Casull, ...)
- (older) Military Sidearms (competition especially for Pistole Marine 04, Pistole 08 Artillerie, Pistole 08 (standard issue), Walther P.38, FN Hi-Power, Colt M1911 and M1911A1, Walther PP or PPK, S&W Victory and M&P models, Radom VIS 35, Mauser C96, Tokarev and others).
There are a couple of other I currently don't participate in like "Centerfire pistol/revolver .32 S&W long", "Rimfire Pistol/Revolver cal. 5,6 mm/.22 w/Optics", "Pistol Magnum" (for Desert Eagles, L.A.R. Grizzly or Coonan) and "Any Centerfire Pistol w/Optics minimum cal. .30/7,62 mm". Every handgun category, except those for cal. 5,6 mm/.22, prescribes specific technical specs for the guns and a minimum power floor (based on the IPSC formula) the ammunition must meet. Each category is scored separately, of course.
It's great fun seeing how well I can do with an assortment of different firearms and calibers. Bullseye shooting certainly demands some concentration and mental discipline, let alone skill from the shooter. I personally enjoy it a lot.
BTW, this year I used the only .22 l.r. pistol I own - an inexpensive Ruger KMK-678GC "Competition Model" - and won the Bavarian Championship with it. Most other competitors brought much more refined match pistols to the match, like Haemmerli 208 and 280, ERMA ESP-85A, Walther GSPs, Benelli MP 90S and whatever... That made my day!