ruger gp100 in 10mm

[The_Shadow]

They gave basicly the same answer for the M&P10mm some years back...

[NCTURBOS]

They gave basicly the same answer for the M&P10mm some years back...

A person gotta have hope... 

K.

[The_Shadow]

A person gotta have hope... 

K.

I hear ya!  If we don't let them know, they never will! :'(

[gandog56]

Yeah, but don't hold your breath waiting for them to do it.......................if they EVER do it.

[wadcutter]

Converting a 357 Magnum revolver to 10mm is a step down in power and doesn't make much sense unless you really got to have a 10mm revolver and you can't find a S&W 610.

[sqlbullet]

Converting a 357 Magnum revolver to 10mm is a step down in power and doesn't make much sense

It is generally pretty well accepted around here that the two are on parity.

To validate this I conducted the following statistical exercise.  I pulled from Handloads.org the best reported velocity based on mfg data, not guest, for 357 bullet weights 110,125,140,158,170,180,200.  I also compiled a list for 10mm for bullet weights 135,145,155,165,175,180,190,200,220) There were impressively fast, especially compared to 10mm data.

But, checking a couple mfg websites I found that the 357 data was based on a 10" test barrel, where the 10mm was based on a 5" test barrel.

I then visited ballistics by the inch and averaged a loss of 200 fps from 10" to a 5" barrel in 357 magnum.  So, I subtracted 200 fps from each 357 mag speed.

I also felt that 10mm load data lacks the depth and maturity that 357 data does, so I audited the speeds against Underwood, and bumped the speed when Underwood offered a faster load.  I did the same for 357 mag data.  Underwood tests using a 6" barrel, but I just gave the 357 the benefit there, rather than handicapping it down.  I also only bumped 357 speeds up, not down.

Then I ran an average of the muzzle energy for these loads.  357 Mag avg was 700.57 and the 10mm average was 700.14.

I would further note that I left in an obviously lame 175 grain velocity of 1285 for 10mm.  This falls between a 1300 fps 180 gr velocity and a 1400 fps 165 grain velocity.  Bumping this to where it should be would boost the 10mm average a few ft-lbs.

The 357 does have better sectional density, and so would penetrate better in a non-deforming bullet.  On the other hand, the 10mm is bigger around and will make a better hole if an expanding bullet didn't.

The 357 Mag is a great round, and definitly a powerhouse.  But ballistically it is a twin of the 10mm based on apples to apples data comparisons.

All that said, I tend to agree that the conversion is not the best investment.  Since the 357 is it's twin, just stick with the original chambering.

[The_Shadow]

I also did a little comparison to the 357 and have used the same loads in the 10mm with in many cases the same velocities.

The 357 mag casing is longer but the 10mm is larger in diameter...
357Mag 180gr Sil Gas Check over Blue Dot 11.0grs @ 1320 fps
10mm 180 XTP JHP over Blue Dot 11.0grs @ 1300 fps

Revolver 6 rounds
Glock 29 11 rounds
Glock 20 16 rounds

[Pinsnscrews]

Wondering if it is possible to rechamber the Charter Arms in .40 to 10mm. I have not been able to come across dimensions for the cylinder.

Personally, I won't be loading for less than 150gr. If it is a 4 inch barrel or longer, not likely to load less than 180gr.

Just comparing, BOOK reload data from Hornady (it was at hand),
.357 8" barrel   10mm 5" barrel
155/8gr XTP (.358 '158gr' w/SD:.177 BC:206 1400fps) (10mm '155gr' w/SD:.138 BC:.137 1450fps) 
180gr XTP (.357 w/SD:.202 BC:.230 1150fps)(10mm w/SD:.161 BC:.164 1250fps)
200gr XTP (.357 NOT LISTED) (10mm w/SD:.179 BC:.199 1150FPS)

I think the 10mm would do very well out of a Snubby, even better than the .357.

[sqlbullet]

I checked the Charter.  Same frame as the 44 special, which has a significantly longer COAL than the 10mm.  I think it would be the easiest conversion out there.  Especially since I own a 10mm finish reamer :-)

[jiminthe burg]

Don't know what made me think of this and maybe a bad idea.

Perhaps, we should "bug " a distributor like Davidson.  Someone posted on another forum that he had never heard of a  gp 100 w/ a 5 " barrel and a responder replied that he had one and Davidsons had Ruger to make a special run of the 100 w a 5" barrel and I think he said Ruger made  500.
I think it was Accurate Sports that had Colt to make a special run of 750 Elite 9 on the 1911 platform.  This was in the 80"s.

I know that both of these were variations of a model already in production but how difficult would it be to make the 100 in 10 mm as the bore and cylinder  would only be .003 larger. If it would handle the .357, I am thinking that in terms of pressure the 100 would handle the 10 MM.

[sqlbullet]

Maybe my math is screwy, but I think it would be .042" or so larger, not .003".

But you are right, the GP100 should take it just fine.  Several custom shops will build you a 10mm GP 100 for enough lettuce.

Now, would Ruger make a run?  Hard to say.  They would have to stand behind them and they may not think it is durable enough.

[The_Shadow]

Yep 0.043" difference

0.4000"
-0.3570"
0.0430"

[Wolfie]

I rather see a 40-10 Ruger LCR, have it in 22M and 357 Mag and its a nice gun.

[jiminthe burg]

Now I feel like an idiot!  In addition to having difficulties with attachments, it looks like i can't add!  I'm 73, can I blame it on a senior moment?

I'll probably be remembered now not  by the quality of my postings but by my errors and difficulties.

[The_Shadow]

Hey Jimmy, Don't beat yourself up over it, it show that you are human!  Anyone and everyone can make a mistake!

There are things we used to know, that we have forgotten about, they say "if you don't use it, you lose it"