I did a test some time ago on these with rifles, smoothbores and handguns- here is what I found:
In a smoothbore Remington bolt .22 rifle designed for shot, the crimped shot is the most powerful, longest range and has the most consistent pattern. Effective "range" with the smoothbore was the longest- about 15 yards. The CCI capsule did not consistently pattern at all out of the smoothbore.
Winchester 62A pump: Both shot fairly well, but patterns were not consistent. The CCI was slightly better patterning, but with less shot that hit the target, and it also seemed less powerful. About 8-10 yards was effective range.
Browning buck mark 5": Neither ammo functioned the slide, but the crimped shot seemed slightly better in power and performance. but was a bit harder to extract manually. Effective range @ 4 yards.
Beretta 21A with right spring removed: The CCI would function the action and I could shoot a mag full with no problems! Patterns open very quickly, but likely still effective on a snake if closer than 8 feet.
The moral of the story is- rifling is detrimental to shotshells, but we have to do with what we have.
