Inline FabricationRepackboxRotoMetals2StainLess Steel Media
WidenersGraf & Sons

Results 1 to 17 of 17

Thread: 10mm GP100 conversions?

  1. #1
    Boolit Master

    Join Date
    Feb 2012
    Location
    Morganton, NC
    Posts
    1,053

    10mm GP100 conversions?

    Seems like the 10mm GP100 might be a good candidate for a conversion to something like a 401 Powermag. I saw where Jeff Quinn did a write up on one converted to 10mm mag. Any other conversions brewing out there?
    To Thomas Jefferson: It's America! We can have our plows AND our guns!

    http://lindsayfarmonsilvercreek.blogspot.com/

  2. #2
    Boolit Master Groo's Avatar
    Join Date
    Mar 2009
    Location
    Ohio
    Posts
    821
    Groo here
    The problem with anything bigger than 10mm/mag is the rim and case size .
    With the original cylinder the metal gets kinda thin.
    In a 5 shot ,,, that is somewhat different.
    10mm mag would be ok as long as you get the correct moon clips to head space on the clip when shooting 10mm or 40S&W.
    If you could get another cylinder from Ruger ,one 10mm mag and one 10mm and with thicker clips 40.

  3. #3
    Boolit Master
    Join Date
    May 2007
    Posts
    3,375
    A 10m revolver sounds like neat deal. The 10 is plenty powerful for my purposes.

  4. #4
    Boolit Master
    Join Date
    Aug 2009
    Posts
    1,308
    At some point of enlarging the hole that forcing cone becomes an issue. It disturbs me that multiple users are cracking their GP-100 .44 (which of course is a .43) forcing cones and at least one with loads that aren't that warm. You would think Ruger would have given that area special attention since they had to know the problems S&W had with their 5 shot L frame .44 special.

    It might be best to just buy one in 10mm and leave it as-is, but it sure would be nice to have a rimmed case, for crimping if no other reason. Factories are only going to want to chamber in factory cartridges. Ruger knows there is a .41 Magnum. I wonder if that would work if they used a 5 shot cylinder?
    Rule 303

  5. #5
    Boolit Buddy Boogieman's Avatar
    Join Date
    Sep 2010
    Location
    Western Ar.
    Posts
    435
    Ruger now has a GP100 in 10mm which has SAAMI max. of 37,500 psi. The 41mag. is rated at 35,000 psi . The groove dia. is only .010 larger in the 41mag. which makes the sides of the forcing cone a whole .005" thinner .
    The 3 people a man must be able to trust completely are his gunsmith his doctor & his preacher ..,his gunsmith for his short term health ,his doctor for long term health ,and his preacher incase one of the others mess up.

  6. #6
    Boolit Master
    Join Date
    Jul 2009
    Location
    Tennessee
    Posts
    1,542
    When Ruger released the 6 shot 10mm it gave me a good feeling for acceptable pressure for my 41 special. Now, I just looked at a picture of the barrel extension/ forcing cone area on a 10mm. It shows a hex shape and notable thickness. Does anyone have one to verify that detail? Ruger may have solved the thin forcing cone sitiuation and a 41 mag is in the wings! I have the 44special and it seems to have a " normal" extension
    https://revolverguy.com/ruger-10mm-gp100/
    Shows a picture and it looks to be hex sided and bigger than the threaded. A sleeve /2 piece ??
    Last edited by rking22; 12-08-2018 at 08:08 PM.
    “You don’t practice until you get it right. You practice until you can’t get it wrong.” Jason Elam, All-Pro kicker, Denver Broncos

  7. #7
    Boolit Master
    Join Date
    Aug 2009
    Posts
    1,308
    I'm seeming to vaguely remember that David Clements would convert GP 100s to .41 special, and 10mm, but not .41 Magnum. Does anyone else remember that?
    Rule 303

  8. #8
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    979
    Wouldn't it be easier to go up in thread size for the barrel shank? Don't give the engineers any more reason to get fancy with a simple solution.

  9. #9
    Boolit Master
    Join Date
    Jul 2009
    Location
    Tennessee
    Posts
    1,542
    Piedmont, that is correct. The 41 Special is "Just Right" for the GP100!
    “You don’t practice until you get it right. You practice until you can’t get it wrong.” Jason Elam, All-Pro kicker, Denver Broncos

  10. #10
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    979
    I'm sure 41 special is cool, but I don't see why Ruger can't make a plain old 41 magnum with just a little engineering. Gary Reeder converts them to 41 mag, although he has some people that love him, some that hate his guts. Not a lot in the middle, and a lot of bad reviews. As I understand he lengthens the frame some, installs a custom barrel and cylinder and there you go. Too bad Ruger can't come out with a "super GP" frame that can handle full 41 mag, 357 max, etc.

  11. #11
    Moderator



    Join Date
    Jun 2013
    Posts
    5,191
    Quote Originally Posted by Piedmont View Post
    I'm seeming to vaguely remember that David Clements would convert GP 100s to .41 special, and 10mm, but not .41 Magnum. Does anyone else remember that?
    He did. Unfortunately he has focused on the Ruger SA market for a while now. Last I spoke to him a few months ago, he was going to be picking up a few Marlin 1894 custom projects. He’s been backlogged a long time, but I continue to pester him. I’ve been very satisfied with his work.

    If Smith can engineer an L frame 44, Ruger can certainly produce a GP 5 shot in 41 Mag/Special and 44 Mag. We already have the 44 special.

  12. #12
    Boolit Master
    Join Date
    Jul 2009
    Location
    Tennessee
    Posts
    1,542
    Click image for larger version. 

Name:	Ruger-10mm-GP100-3-768x769.jpg 
Views:	12 
Size:	34.1 KB 
ID:	231842
    Figured out how to show the picture, is this Ruger's solution to higher pressures in the big boreGP100s? My 44special does not look like that, very thin at the bottom.
    Last edited by rking22; 12-10-2018 at 12:49 PM.
    “You don’t practice until you get it right. You practice until you can’t get it wrong.” Jason Elam, All-Pro kicker, Denver Broncos

  13. #13
    Boolit Master

    Join Date
    Feb 2012
    Location
    Morganton, NC
    Posts
    1,053
    Interesting. What does the muzzle look like?
    Quote Originally Posted by rking22 View Post
    Click image for larger version. 

Name:	Ruger-10mm-GP100-3-768x769.jpg 
Views:	12 
Size:	34.1 KB 
ID:	231842
    Figured out how to show the picture, is this Ruger's solution to higher pressures in the big boreGP100s? My 44special does not look like that, very thin at the bottom.
    To Thomas Jefferson: It's America! We can have our plows AND our guns!

    http://lindsayfarmonsilvercreek.blogspot.com/

  14. #14
    Boolit Master
    Join Date
    Aug 2009
    Posts
    1,308
    Quote Originally Posted by osteodoc08 View Post

    If Smith can engineer an L frame 44, Ruger can certainly produce a GP 5 shot in 41 Mag/Special and 44 Mag. We already have the 44 special.
    Well that is the whole point. Of course they can reengineer it, but they chose not to and we have Ruger .44 Special GP-100s cracking forcing cones, just like the original S&W L frames did. Ruger dropped the ball, again.
    Rule 303

  15. #15
    Boolit Master
    Join Date
    Jul 2009
    Location
    Tennessee
    Posts
    1,542
    Click image for larger version. 

Name:	Ruger-10mm-GP100-6-1200x1201.jpg 
Views:	8 
Size:	30.7 KB 
ID:	231856

    Looks "normal", that is from the link I posted a few days ago. Seems they have done something to support the forcing cone area. I have an L frame 696 and ,so far, no issues. I shoot Skeeter loads in both my y96 and GP100. I considered srinking a support ring around the area on my y96 but there was no room above the has shield. I have seen NO reference to a beefed up forcing cone on any of the Ruger adds or reviews except the one I referenced. And no explanation there! Considering the most issues with the 696 were light bullets and fast loads, Ruger seems to have tried to "do something".
    “You don’t practice until you get it right. You practice until you can’t get it wrong.” Jason Elam, All-Pro kicker, Denver Broncos

  16. #16
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    979
    Quote Originally Posted by Piedmont View Post
    Well that is the whole point. Of course they can reengineer it, but they chose not to and we have Ruger .44 Special GP-100s cracking forcing cones, just like the original S&W L frames did. Ruger dropped the ball, again.
    I don't have the measurements on either the L frame or GP100, but to my eye, the GP100 forcing cone looks thicker, at least adequate for the job. I don't think they are cracking left and right. I've heard a couple cases, but I can't even find them when searching "gp100 cracked forcing cone". The only thing that comes up is a 357 mag, shooting no less than the infamous 125 grain bullets.

  17. #17
    Boolit Master Groo's Avatar
    Join Date
    Mar 2009
    Location
    Ohio
    Posts
    821
    Groo here
    The 10mm/40/.410cal bullet is best for a 6 shot application in L frame guns...
    Ruger was trying to get most from a frame in production.
    The 44 spec was a test to see how far people would push things.[a little too far!!!]
    I doubt there will be a 44 mag , but a 41 spec [like a 480 ruger] you might see....
    IF the shooters have no problems shooting "nuclear" level loads, because some will try to mag it a 41 mag.
    The difference and lack of rim on the 10mmgives max steel in the cylinder and barrel of a 6 shot.
    If ruger [or others] get around the moonclip thickness problem, I would nor be supprised to see a 10mm mag/10mm/40 from a distributer.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check