I've run a few rimfire matches with the WBSF target, small 10 ring.
I ran two classes target rifle and factory rimfire class so not modifications to the rifle except tune the trigger, of course while I used a factory CZ452 I put myself in the target rifle class.
The highlight for a lot of the factory shooters was a wipout and to recall everyone had some, they did see what experience and a good rifle can do as I managed a 670 12x with the CZ. The highest factory score was 551 4x and while not high all shooters came back for another go.
I think a level playing field is the crucial thing to get people coming back and also to make it fun. Even using a factory rifle I put myself in target rifle class as I think experience counts for a lot.
Years ago there was a team postal shoot going and I got a few NZ shooters to participate, this was in factory class. Well one shooter bailed at the last minute and didn't turn up so I used my BSA MK II and managed a better score at 100yds with the 22 than the others got with their centrefire rifles, needless to say I couldn't convince them to come and compete again...........all I had to do was drop a few more points and the fun may have continued.
Rimfire shooting is fun, but I really enjoyed it when we shot 50yd and 100yd rimfire group competitions, there was nothing like watching that bullet curve through the air and watching it go through the target.
Good luck in getting the rimfire shooting included.
Ian