GP100 10 mm to 10 mm Mag Conversion

[TooManyChoices]

Anybody playing with the 10 mm Mag? Starting load development using Hornady 180 XTP, Starline Brass and 296.

DoubleTap has commercial loads with 200 gr cast and they are a hoot to shoot.

Anyone traveled this path lately?

 

[dannyabear]

Why????? Just buy the pistol the 10mm wants to be, a 41 Magnum

 

[Rule3]

"GP100 10 mm to 10 mm Mag Conversion"

What does that mean??

 

[colt_saa]

I have been shooting the 10MM Magnum cartridge for many years in the 310/610 family of revolvers, as have many of your fellow Forum Members.

I run the 200 grain projectiles over 21 grains of H110 and break the 1600 FPS mark with the longer revolver

I have not chronographed it out of either snubby . . . . Yet

 

[Sevens]

"GP100 10 mm to 10 mm Mag Conversion"

What does that mean??

Not sure if you are being serious with the question, but if yes, a couple quick answers:

The 10mm Magnum, as pictured above by colt_SAA is a lengthened 10mm Auto cartridge. It was a factory chambering in the IAI (Irwindale Arms, formerly AMT) AutoMag IV pistol. The round never really caught on and brass is scarce but occasionally offered by Starline. There exists no factory ammo that I am aware of, but boutique makers like Underwood or DoubleTap may offer it.

To the second part of the statement...
Ruger recently began offering 10mm chambered Redhawk and GP-100 revolvers. Custom gunsmithers have offered 10mm conversions on GP-100's for many years.

So... cut the 10mm Ruger revolver chambers a bit deeper and now you are 10mm Magnum capable.

It's is definitely the L-O-N-G way around when you take a cartridge designed for a semi-auto and use it in a revolver, but when you are an enthusiast, many things only need be possible and there is no other "necessary" reason.

Benefits: Odd and interesting, which is often a recipe for fun, especially when you are an enthusiast. Also, .40 cal pistol bullets are numerous and plenty and the choices available are wide and many are offered in bulk, all of which are things that (mostly!) can't be said of .410" slugs for the .41 Magnum. You also get ammo swappability in the .40 S&W and 10mm area, not so much in the 10mm Mag unless you have the IAI AutoMag IV. Of course, you can also do moon clips, if your rig is set up for them. Many love them.

Cons: .41 Magnum is certainly plug & play. It would be my thinking that -NOBODY- who plays with 10mm and 10mm Magnum in revolvers would ever suggest that .41 Magnum is silly or useless, but you couldn't expect the same from .41 Magnum fans.

At the end of the day, we are all gun cranks, and that SHOULD pull us all together.

 

[Sevens]

On a related subject of "semi-auto cartridges in revolvers", there is a long and interesting history of them. The most obvious is the .45 ACP which began as a "best fast answer" for wartime supply, then became a consumer product because of mountains of milsurp ammo available.

The .30 Carbine Blackhawk was also marketed to jump on the piles of surplus war ammo. (less known Blackhawk fun trivia: the .30 Carbine B'Hawk hit the market BEFORE the first .45 Colt Blackhawk!) We're all familiar with 9mm in revolvers. We've seen a precious few .40cals.

I submit as one of the most odd "chase your tail" caliber/gun combos is the big Dan Wesson revolver that was factory offered in .460 Rowland, a non-SAAMI high horsepower, lengthened and strengthened .45 ACP.

 

[Rule3]

Not sure if you are being serious with the question, but if yes, a couple quick answers:

The 10mm Magnum, as pictured above by colt_SAA is a lengthened 10mm Auto cartridge. It was a factory chambering in the IAI (Irwindale Arms, formerly AMT) AutoMag IV pistol. The round never really caught on and brass is scarce but occasionally offered by Starline. There exists no factory ammo that I am aware of, but boutique makers like Underwood or DoubleTap may offer it.

To the second part of the statement...
Ruger recently began offering 10mm chambered Redhawk and GP-100 revolvers. Custom gunsmithers have offered 10mm conversions on GP-100's for many years.

So... cut the 10mm Ruger revolver chambers a bit deeper and now you are 10mm Magnum capable.

It's is definitely the L-O-N-G way around when you take a cartridge designed for a semi-auto and use it in a revolver, but when you are an enthusiast, many things only need be possible and there is no other "necessary" reason.

Benefits: Odd and interesting, which is often a recipe for fun, especially when you are an enthusiast. Also, .40 cal pistol bullets are numerous and plenty and the choices available are wide and many are offered in bulk, all of which are things that (mostly!) can't be said of .410" slugs for the .41 Magnum. You also get ammo swappability in the .40 S&W and 10mm area, not so much in the 10mm Mag unless you have the IAI AutoMag IV. Of course, you can also do moon clips, if your rig is set up for them. Many love them.

Cons: .41 Magnum is certainly plug & play. It would be my thinking that -NOBODY- who plays with 10mm and 10mm Magnum in revolvers would ever suggest that .41 Magnum is silly or useless, but you couldn't expect the same from .41 Magnum fans.

At the end of the day, we are all gun cranks, and that SHOULD pull us all together.

I was serious. I did not understand the question. Nothing was said about a 10 mm auto.??


I load a 10mm Magnum and shoot it in a revolver. As far as I knew the Ruger GP100 is a 10 mm magnum and was not a 10 mm auto mag.?? I also have a 10mm mag semi auto.

 

[Sevens]

Ha, now you have me as confused as you.

You are saying that you load and shoot 10mm Magnum? That makes at least three guys in this thread that load and shoot 10mm Magnum. Do you guys have any idea how rare y'all are? By and large... statistically speaking... 10mm Magnum would be an anomaly. As in, YES, it absolutely exists but based on numbers and compared to 9mm, .45 Auto or even 10mm Auto, the number of 10mm Magnum shooters is a number so small that it almost fails to exist in statistical terms.

That along makes it cool!

Also, you are saying that your revolver chambers 10mm Magnum with no modification? What revolver is this?

And you also have a 10mm Magnum semi-automatic pistol? And what make and model would this be?

I have and shoot a revolver in .357 Bain & Davis, and I expect that almost nobody anywhere still goofs around with this oddball. But I understand why it's fun to use oddball stuff.

 

[Dieseltech56]

I am not shooting 10mm magnum....yet, but I have been considering getting one of my 14 inch contender barrels rechambered for it. I have been long loading 10mm in contender barrels but they are not even close to reaching magnum case capacity.

 

[Rule3]

Ha, now you have me as confused as you.

You are saying that you load and shoot 10mm Magnum? That makes at least three guys in this thread that load and shoot 10mm Magnum. Do you guys have any idea how rare y'all are? By and large... statistically speaking... 10mm Magnum would be an anomaly. As in, YES, it absolutely exists but based on numbers and compared to 9mm, .45 Auto or even 10mm Auto, the number of 10mm Magnum shooters is a number so small that it almost fails to exist in statistical terms.

That along makes it cool!

Also, you are saying that your revolver chambers 10mm Magnum with no modification? What revolver is this?

And you also have a 10mm Magnum semi-automatic pistol? And what make and model would this be?

I have and shoot a revolver in .357 Bain & Davis, and I expect that almost nobody anywhere still goofs around with this oddball. But I understand why it's fun to use oddball stuff.

Forgive me as I am old and senile and and a might bewildered. I was not aware that there existed a 10MM MAGNUM.


Dazed and Confused.



No, I do not have a MAGNUM just a wee little regular 10MM


I know not of a SAAMI 10MM Magnum (propriety round)


Taffin Test the 10 mm Magnum

 

[TooManyChoices]

It would appear I caused a quagmire with a simple request. My thanks to Colt SAA and Sevens for their responses. I did have the GP100 reamed and it does shoot 10 mm Magnums and they do hum.

I have the Taffin data and am currently trying to work loads up with Hornady 180 grain XTPs. Any experience? I am using 296 and not AA9.

 

[phenson]

I have a 10mm Magnum GP100 that was converted by Tyler Gun works. I contacted them about converting my S&W Model 610. They told me they were unable to do it without an explanation. Can anyone tell me a competent gunsmith who would convert my 610 to 10mm Magnum? I know it can be done and that the N Frame can handle it. I just cannot find any info on who will do it.
Thanks in advance.

 

[BLUEDOT37]

10AUTO to 10MAG

So... cut the 10mm Ruger revolver chambers a bit deeper and now you are 10mm Magnum capable.

Last year when I reamed my 40S&W to 10mm Auto, by hand, that .142" difference in length wasn't too bad, plus it was just one chamber.

Recently I decided to ream my 610-3 from 10mm Auto to 10mm MAG, by hand, & found it's .263" difference in length was QUIT A BIT more, plus you have (6) chambers to do.

After doing (3) chambers my hand had blisters that demanded I wait a few days before tackling the other (3).

It's quit a bit deeper, times six. Ouch!

.

 

[Bobby B.]

Question, pushing a 200 grain projectile 1600 FPS in a auto case makes me wonder how folks are crimping. That is stout and certainly makes me pause and think about bullet setback.

 

[OKFC05]

I can't help but wonder if the 10mm mag in a revolver is going to get us into the same problems we had with the .357 maximum? Remember it was the greatest except for topstrap cutting that was not self-limiting with 296? Great cartridge for a Contender, but soon dropped for revolvers.

 

[Biggfoot44]

I have actually heard of the 10mm Mag , but don't think I've ever seen such a firearm in the flesh .

Of course I understand * Because you can * , and * Unusual and Interesting is Good ! * . It's just a strange turn of events when I'm Not the person with the most obscure ballistic interest in the room .

 

[colt_saa]

I have a 10mm Magnum GP100 that was converted by Tyler Gun works. I contacted them about converting my S&W Model 610. They told me they were unable to do it without an explanation. Can anyone tell me a competent gunsmith who would convert my 610 to 10mm Magnum? I know it can be done and that the N Frame can handle it. I just cannot find any info on who will do it.
Thanks in advance.

Have you tried talking with Mark at Pinnacle yet?

 

[colt_saa]

Question, pushing a 200 grain projectile 1600 FPS in a auto case makes me wonder how folks are crimping. That is stout and certainly makes me pause and think about bullet setback.

While I can not speak for all hand loaders, I roll crimp or collet crimp all heavy recoiling cartridges that are intended to be fired in revolvers of any caliber

 

[colt_saa]

I can't help but wonder if the 10mm mag in a revolver is going to get us into the same problems we had with the .357 maximum? Remember it was the greatest except for topstrap cutting that was not self-limiting with 296? Great cartridge for a Contender, but soon dropped for revolvers.

As far as I recall, only Ruger discontinued it's 357 Maximum firearms due to topstrap cutting.

The 10MM Magnum has been used in revolvers for decades now as has the 357 Maximum, 357 SuperMag, 357/44B&D, 360 Dan Wesson, 375 SuperMag, 414 SuperMag, 445 SuperMag, 454 Cassull, 500 S&W and various other jumbo cartridges that can handle HUGE amounts of H110/296

 

[reddog81]

Question, pushing a 200 grain projectile 1600 FPS in a auto case makes me wonder how folks are crimping. That is stout and certainly makes me pause and think about bullet setback.

Do you mean bullet jump? Bullet setback isn't going to happen in a revolver. Assuming you can get good, consistent neck tension you'd probably be fine. Most people shooting loads that hot probably roll crimp for a revolver.