Hmmmm - for novelty shoots, I like either the .58's, or the .69. Card cuts, string cuts, briquets, string-bean cuts, knocking the shotshell out of the coroplast sheet- only the base of the rim's showing (shot close, so you haved to aim high, over the rim) - larger wins for me, every time. Cutting cards along with all the other novelty targets are usually much more difficult with a .32, than either of the noted calibres. There is a difference between a .32 and a .40 as well, even though mathematically, there seems to be little - every additional fraction of an inch helps. BTW- the larger sized ball advantage works all the way around the ball on some targets, as in hitting. Splitting, hitting or cutting objects, would be larger both sides as an advantage.
We shoot our trail often - generally every Sunday unless it's too cold. Last year, we missed only 2 Sundays all winter. It is surprising how many shots appear to be "barely" misses, and how many appear to "barely" hits which barely move the targets- yet a hit is a hit- scores the same as a centre hit. Novelty targets alng with the regular gongs are much easier - for me and my sloppy shooting, with the Double Barreled .58, the Musketoon, or the .69 English styled gun, than they are with the .45, .40 or .32. The shorter barrels are no hindrance - for some odd reason.