have had my Nova about a year. great gun so far. the only tube i have used on it is one for Heavy shot from Cabelas. i have shot 3 inch #6 remington heavy shot turkey loads in it which patterns well but i think it could be better. i was looking at a Rhino .640-2 inch tube and was wondering if anybody else had tried this combination or if there is a better combo. also was wondering if anybody else's Nova had a hard trigger, like mine does, and if they new of a fix for it.