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Post by magnumwheelman on Apr 6, 2018 23:35:22 GMT -5
So... maybe this is weird... but here goes... 1st... I've been thinking of sending my GP-100 for a 10 mm conversion... 2nd... I'm close to finishing my 401 Powermag cases... the last of them are final formed, and tommorow I go over to my buddies, and knurl and flatten the 41 magnum off my then completed 401 cases... when my idea hit me... why shave off the cylinder of my GP-100 for moon clips, and an auto cartride, when I could easily make a rimmed 10 mm, or a 40 caliber "special" cartridge by doing the same process I'm doing to make 401 Powermag out of the 41 Magnum cases, to 10 mm rimmed out of the 41 Special cases I think I remember reading about...either 10 mm rimmed, or 40 caliber special... Thoughts??? Lots more advantages running a rimmed case in a double action revolver, than an auto case ( bullet crimp for one ) Conversion would actually be less involved ( possibly cheaper )  Heck... there might even be a speedloader that wpuld work with these cases, since the 41 magnum rims aren't altered |
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Post by coldtriggerfinger on Apr 7, 2018 0:08:05 GMT -5
Ya, sounds like your onto something there. Do you have a pic of a 401 case next to a 10mm case ??
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Otony
.327 Meteor
Posts: 722
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Post by Otony on Apr 7, 2018 2:42:11 GMT -5
The case body will fit, but I don't think you have enough available room for all six rims with the cylinder diameter.
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Post by magnumwheelman on Apr 7, 2018 7:11:07 GMT -5
That might be a problem... I've not measured it
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Post by magnumwheelman on Apr 7, 2018 7:33:39 GMT -5
Well... I just took a picture of 6 of my 41 mag converted Powermag cases stacked over the 357 mag chambers, on the open cylinder of my GP-100... so the thought is a definite maybe...  |
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Post by magnumwheelman on Apr 7, 2018 8:22:17 GMT -5
Hmmmm looks like Dave Clements currently does conversions to 41 special... so the cases must work... on his website he cautions about not using hot loads with the 10 mm, so by not going to 41, and staying with the 40 bore, is going to offer more margin of safety in cylinder thicknesses
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Post by tinkerpearce on Apr 7, 2018 14:33:23 GMT -5
Sounds interesting...
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eskimo36
.375 Atomic
Oklahoma
Posts: 2,049
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Post by eskimo36 on Apr 8, 2018 8:50:59 GMT -5
I have a midframe flattop in 10mm. A rimmed option would be an easy thing to try.
Curtis
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Post by magnumwheelman on Apr 10, 2018 7:14:44 GMT -5
That picture of my 401 cases on my GP-100 cylinder...  |
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Post by magnumwheelman on Apr 17, 2018 7:37:28 GMT -5
So I must not be as strange as I thought, I've been e-mailing with Dave Clements, & another customer of his is working out a deal with Starline for 10mm Rimmed cases... so David is going to contact that customer & see if I can get 500 - 1000 of those cases... he's also agreed to do my revolver, & my GP-100 will be on it's way there this week, or early next week , so the barrel can get started... thinking about shortening the barrel to 3" & a basic tune up... my GP is an 80's model stainless 4" barrel... any other Clements work that should be done while it's there??? I have 100 - 41 Special cases that will be here this week, that I'll start converting to 10mm Rimmed, so I at least have some cases I can send him to start the gun, if everyone ends up waiting on Starline... also I'm not sure what the specifications were for this other customer with his 10 mm Rimmed cases ( rim diameter, COL, for example ) so I may end up making 500 cases like I did for the 401... but it would be nice to have correct head stamps on these custom cases |
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Post by magnumwheelman on Apr 26, 2018 20:57:29 GMT -5
1st step formed 25 of my 10mm rimmed cases tonight... will be trying to get them on the lathe this weekend to do the 2nd step...going to get 25 cases done, and a couple dummy cartridges, to send with my GP-100 to go to Clements for the conversion |
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Post by win1894s on Apr 27, 2018 5:40:48 GMT -5
I was going to call Clements to see if 38/40 was doable in the Gp 100.But looking at your pic it's doubtful.10 rimmed seems a better idea.
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djw
.240 Incinerator
SW Michigan
Posts: 83
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Post by djw on Apr 27, 2018 10:55:28 GMT -5
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Post by magnumwheelman on Apr 27, 2018 10:56:27 GMT -5
as it is on 10/40 caliber with a 6 shot cylinder, there can't be much meat left under those cylinder stop notches ( if you look at the picture with the 401 cases sitting on the cylinder... those are over the existing 357 chambers )... but Dave does do 41 special so while the difference ( 1/2 of radius ) is marginal, I think there would be just a little more safety margin there in cylinder wall thickness under the stop notch... thinking 38-40 case might cut through the notches???
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Post by magnumwheelman on Apr 27, 2018 11:05:27 GMT -5
I looked at the article on the 10 MC... if you look at the picture of the cylinder & my picture in this thread... it at least appears that the stop notches are shallower on the 10 MC not sure if that is good or bad as far as lockup & chamber wall thickness... the extra thickness is good, as long as we didn't lose anything in the way of reliability with the shallower stop notches???
I'll still be doing this conversion to 10 Rimmed as this GP-100 was my 1st revolver... so I'd rather keep it than trade it in on the newer model...
also curious if you guys think shortening the cylinder for the moon clips effects the pressure sensitivity to the stop notch area... likely not, as the cartridges are held back where they would be, if the cylinder had not been shortened... with the rimmed version, there is no reason to shorten the cylinder though...
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