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Interesting... Thanks Terry!

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OK. Somebody 'splain something to me. "A chamberless 12 that later morphed to a 3.5 inch 10"????


Perry M. Kissam
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Hello Perry,The term "chamberless 12" is actually a bit of a misnomer in that the barrels actually had a chamber with very thin forcing cones,which was made for a thin brass 12 bore case that could be up to 3"long and an 11 bore wad was used to fit the case and the oversized bore which was also 11 bore. These guns were basically built on a 10 bore action and barrels.This gun has 3 sets of proof marks.The first is 12 bore black powder,the second is 12 bore 3" nitro,and the last was done in 1962 when the gun was rechambered to 3 1/2" 10 and nitro proofed to 4 Tons /sq. in. with a bore diameter of .765 which it has today.It has 45 thou of choke in both barrels. Hope that all makes sense...


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Terry-amazing that bismuth can handle geese at 50 yards. You are talking about the latest bismuth, not the original stuff? What is the velocity?

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The Bismuth I have is the original product.I had an opportunity to buy 35 lbs of it a while back at a very attractive price.I know that there can be be some problems with it being somewhat brittle. The earlier loadings I made were not buffered and while the patterns were acceptable they were not as dense and there was evidence of some flyers that could have been split or damaged pellets.Buffering made a huge difference in density and completely eliminated the flyer issue.Cross referencing some other published recipes I would put the velocity at around 1250 ft./sec.

Last edited by Terry Lubzinski; 01/12/18 12:15 AM.

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It does now Terry. I see now that the chamber was apparently reamed out and lengthened. What about the bore diameter? Has there been any change in that, or was the change only to the chamber to effectively change the "gauge" classification of the gun? This is probably simple to most/many of you, but certainly new news to me, so please pardon the questions.


Perry M. Kissam
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The original bore designation was 11 which covers bore sizes from .753-.763 I suspect that the original bore was likely .760 and had a fine bore to the current size before reproofing as a 3 1/2" 10.
.


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Major kwel! Glad that you are experiencing the results you describe. Expect it may be lost on many, but genuinely appreciate your achievement; it is significant. Also like the island locks and fence treatment on your gun!

Good opportunities to you!

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