it should be bore the same diam all the way through as it uses a heel based bullet so its cylinder length that will be the deciding factor
if your going to get into the .32 colt brass thing it will not matter much because you will only find .32 short colt
i dont recamend shooting old .32 rimfire ammo(cil,diminion,ect) as this is collector ammo by now. navy arms ammo is newer
id love to find a way to form proper .32 rimfire cases (doable but a pain to get right)
