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Post by 38 WCF on Feb 8, 2019 19:38:47 GMT -5
Would this conversion be possible ?
10mm to 38-40 in the GP 100
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Post by 45MAN on Feb 9, 2019 7:30:49 GMT -5
THE 38-40 IS A BOTTLE NECK, IF IT IS NOT BIGGER AROUND AT ITS WIDEST DIAMETER THAN A 44 SPECIAL. MAYBE, I HAVE BEEN CURIOUS ABOUT THIS MYSELF.
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Post by mobjack on Feb 9, 2019 9:36:46 GMT -5
Looking at Ruger's website, the 10mm is a six-shooter, while the 44 Special is a five-shooter, it doesn't look to me that the 10mm has enough material in the cylinder to work. The good thing is the sixshot doesn't have the bolt notches directly over the chamber, but I would think that a conversion to 38-40 would need a custom cylinder. This is all speculation on my part, because I don't have either revolver to measure.
What I found by doing a quick Bing search, is the major dimensions of the 38-40 cartridge, are closer to the 45 Colt, than the 10mm. I believe a custom five shot cylinder would be needed. But this is a question the custom gunsmiths can answer.
Mobjack
No gunsmith, but I was a machinist in a previous life. |
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Post by 38 WCF on Feb 9, 2019 9:49:34 GMT -5
Well, I sent this question to David Clements and he said the cylinder on the GP 100 is to small in diameter to allow the rims of the 38-40 to fit without bumping into each other.
So, to answer my own question, no, not possible.
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Post by barbarosa on Feb 11, 2019 23:17:54 GMT -5
Why not punch it out to 10 mag?
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Post by magnumwheelman on Feb 12, 2019 6:52:48 GMT -5
Cylinder is too thin at the stop notches for the pressures capable in 10 mag... I have a S&W 610 that I had chambered for 10 mag, which is an N frame & slightly bigger than the GP... I decided to do a rimmed 10mm conversion on my GP ( Dave will not chamber the GP in 10 mag ) I chose the wild cat 10mm Rimmed, just to keep the extra margin of safety the 10mm offers over the 41 Special, in cylinder wall & forcing cone thickness... 41 special is an option on the GP from Clements, as the 41 is a lower pressure round than the 10mm
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Post by JSutter on Feb 13, 2019 16:47:41 GMT -5
Change cylinders? Like the Buckeye Blackhawk..
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Post by taffin on Feb 13, 2019 17:00:10 GMT -5
Change cylinders? Like the Buckeye Blackhawk.. THE CYLINDER IS TOO SMALL FOR SIX .38-40s AND CUSTOM CYINDER WOULD NEED TO BE A FIVE-SHOOTER WHICH WOULD REQUIRE CHANGING THE GEOMETRY OF THE SIX-SHOOTER SO NO SWAPPING OF CYLINDERS |
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Post by taffin on Feb 13, 2019 17:01:45 GMT -5
Change cylinders? Like the Buckeye Blackhawk.. THE CYLINDER IS TOO SMALL FOR SIX .38-40s AND CUSTOM CYINDER WOULD NEED TO BE A FIVE-SHOOTER WHICH WOULD REQUIRE CHANGING THE GEOMETRY OF THE SIX-SHOOTER SO NO SWAPPING OF CYLINDERS AND CYLINDER WINDOW MAY BE TOO SMALL FOR A FIVE-SHOT .38-40 CYLINDER |
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Post by JSutter on Feb 13, 2019 18:24:21 GMT -5
Ach OK thank you..
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Post by ddixie884 on Feb 14, 2019 3:33:35 GMT -5
Jeff Quinn opened his GP100 10mm out to 10mm Mag. He wrote it up on Gun-Blast.
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