Can someone please tell me which is correct?
Double shotguns have a swamp in the barrels. Meaning there is a very slight curve down the barrel from the breach to about mid length. Then there is a slight curve upwards to the muzzles.
If you measure the drop at comb and at heel with a long precison straight edge that contacts the rib at the muzzles - not resting on the top of the bead, you will get a certain measurement for the drop at comb and at heel.
But if you use a shorter straight edge that only extends to the mid point of the rib on the barrels. You will get different measurements for drops at the combs and at heel. The measurements might be as much as 1/4 inch MORE at the heel.
I assume the long straight edge method is proper? Thanx.
