So for right it is .170(start of forcing cone) to .076 (end of forcing cone)at 10 inches in length

Left is .169 (start) to .103 (end) at 7 inches in length.

Yeah I think I got that right!

So does this make sense?

Rick: check the image I posted. The WT of the FC is thicker than the end of the chamber. The critical number is the end-of-the-chamber before the forcing cone, and it's usually not hard to tell by "feel" and the increase in WT when the gauge makes that transition.
.170" would be much thicker than any 12g end-of-the-chamber thickness I have measured; about what you would expect for 10g.
Is the gun a No. 2 frame? If a No. 3, that number might be possible and would explain the relatively thick 9" from breech numbers, and we can all take a big sigh of relief ;)

Its a number 2 frame gun, I it sent out in 2017 and got the all safe but didnt get any documentation on it, I have put roughly 300 rounds of featherweights and about 100 RST's through it. This year I thought it would be neat to get the numbers and frame it with the letter so I sent it in again and now I feel I'm a different story. I posted here to see what the consensus was on the numbers as I'm still learning. Now I'm getting a little nervous!

How long are your forcing cones?

It sounds like you’re saying they are 10” in one barrel and 7” in the other. That certainly isn’t factory.




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Yes from what I was told and I can understand it not being factory, best laid plans right! The only work I personally have had done was opening the choke in 2018.