First, ICORE is fun. Shoot what you have. I've shot ICORE matches with all my K,L, and N frames.

If you have a dot sight and/or comp., you are in open. You'd likely want an 8 shooter.

If you have iron sights and no comp. shoot limited. You can shoot moons or speedloaders. Again, 6,7,or 8 shooters.

If you want to shoot a 6 shooter with speedloaders, retro may be for you.

I normally shoot in limited with my 627-4 .38 Super.

I will shoot some retro this year though.

Have fun,
Dave