Re: 1942 Field Grade chamber length Archived Message
Posted by David Williamson on February 23, 2015, 9:28 pm, in reply to "Re: 1942 Field Grade chamber length"
The only place where a fraction of an inch would be used for measurement would be in carpentry and other trades that use a scale or ruler for measurements. Most gun manufacturers used thousandths of an inch and I can say that in the drawings from Hunter Arms that are in Brophy's book, the tolerances used in most cases were +/-.002., and have seen some that were +/- .0015. The chamber dimensions for an L.C. Smith 12 gauge 2 3/4" chamber are .811 right past the rim to .797, at 2.750. The taper is 1 7/8" in 12 1/2" or .014 in 2 3/4". The only way to measure this is to have a gage with these dimensions. I have made chamber gages with these dimensions and if you drop the gage in it bottoms at the 2 3/4" mark and is hard to pull out. All the ones I have measured were 2 3/4". I know there are short ones out there unmarked, why is anyone's guess. Any gage not to Hunter Arms drawings and specifications, is in my estimation not an accurate gage for measuring an L.C. Smith to get an accurate measurements.
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