CCI Shotshell .45 Other

A: Charles, yes but the patter is worse the longer the rifled barrel. the soft lead shot will not damage the barrel. Test of using these through different rifled barrel lengths here (the shorter the better the pattern as rifling distorts the pellets more) : https://www.youtube.com/watch?v=YxphDh9ydII&t=519s

A: No, this won't damage your rifle. Your barrel is made of steel and this is lead, so it won't hurt anything. These are more meant to be shot out of a pistol but it'll work fine in your Henry. Hope this helps.

A: John, yes Sir, it will work no issue. With these the shorter the rifled barrel the better the pattern. Watch complete test here : https://www.youtube.com/watch?v=YxphDh9ydII&t=523s

A: Yes, 45 long colt and 45 colt are the same and these 45colt round shells will work fine in your Derringer. Hope this helps.