Stan is right. I have never seen a set of double bbls which became parallel at the muzzles. As well as looking down the bores as Stan suggested I have also measured a few sets of bbls. I did this by measuring the bbl od at regular intervals & then measuring total width across the bbls at the same intervals. In every case I measured the bbls continued to converge all the way to the muzzle.
This bbl convergence is put there for the very purpose of causing both bbls to hit at the same point, if they were parallel they would impact apart due to the guns movement prior to the shot exiting the bbls.
