RE: OK, which ones can I use?
Kicks will tell you absolutly not , but depending on the constriction of the tube you buy, you should not have a problem. All of the tubes that I have seen for hevi-shot have come in a .675 constriction, so if the one you are getting one that is that size or larger you shouldn't have a problem. I have shot hevi through a 680 without any problem. Hope this helps.