There are only a couple of classifiers in which having more than ten rounds is of any advantage, so capacity shouldn't impact your classification.
I think there's no Open 10 because if it was LIMITED to 10 rounds, it wouldn't be Open, would it?
hmmmm... 10 rds in the gun or 30???? I saw Rob leatham whoop Open division with a Singlestack and 8 rds... I guess thats why they call him the great one..
Aside from him, I don't think your gonna be competitive against shooters in your class with bigsticks. I have a STI EAGLE 5.5 open pistol in .45.... I use it for steel or pins, as thats all its good for. probably rebarrel the top end, and build a cool semi longslide iron sighted fungun..
The "point" was "grandfathered"; the rest was a mild attempt at humor, as limiting magazine capacity is something best left for other more backward countries to enact.
Or New Jersey.