European guns generally have longer 'end chokes' than American guns, the Rem autoloader at least in 10 bore, has no end choke (I've read).
; The end chokes on my AYA 10 bore were almost 2".
; I actually hadn't thought about the end chokes when discussing this with my friend. You are right, 2" would be better, although 1-1/2" might work OK.
; My friend sugested to rifle the entire barrel and that's probably what we'll end up doing.