Muzzle Diameter Question - GH vs Repro
I have a Parker GH 12 ga that I acquired this year as well as a 12 ga Trojan and a Repro SS 12 ga. I was measuring the muzzle diameters of the them tonight and noticed that the Repro measures .723 and .726 and is marked MOD and IMP. When I measure the others they are .698 / .703 and .690/.706. The Trojan, according to the letter is Full/Mod but I am not sure about the GH. The actual measurements are not my concern necessarily but the difference between the older guns and the Repro is significant. Why would there be this much difference (i.e. Trojan MOD=.706 and Repro MOD=.723)?
I measured using an internal telescoping gauge and measured with micrometer so there could be some error in the actual numbers.
By comparison, I have a 20ga Repro and an Ithaca NID 20ga that have muzzle diameters that are almost identical.
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