That's interesting! I'm more curious than ever to see what the letter says. It sounds like 3" factory chambers are not out of the question yet.
I carefully remeasured my chamber end wall thickness and the lowest reading was .096" left and .105" right. I measured a lot of locations and it was an eye opener how much variation there was. The .096" was a single low spot, all other readings on the left barrel were over .105" with a high reading of .112". The right barrel was likewise over .110" except in that one spot and had a high of .118". I recently got the gauge from Brownell's and am trying to be accurate with it. It's sensitive to pressure, to say the least.
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