What’s so great about 10 mm?

[crstrode]

When I was shooting IPSC, (40 years ago) the greatest things about 10mm was the noise and recoil.

Both were much too great for me, so I stuck with .45.

 

[DR505]

You say I`m cherry picking when I show you a boutique load that surpasses your mighty 10mm. 180 is the standard weight for 10mm and heavy for the 357 magnum.

I always considered 190-200 gr as the standard weight for 10mm, 165-180 gr as the standard for .40 S&W, and 125-158 gr as the standard for .357 magnum. Our service ammo in 10mm was 190gr and service in .40 S&W was 180gr. Back when I carried a Model 27 the service ammo was 158 gr.

 

[Mike_Fontenot]

[...]
Our service ammo in 10mm was 190gr [...]
[...]

WOW! You must have been one of the very few cops who were issued a 10mm service weapon. I'm guessing that didn't last very long ... too many people couldn't shoot it well.

 

[DR505]

WOW! You must have been one of the very few cops who were issued a 10mm service weapon. I'm guessing that didn't last very long ... too many people couldn't shoot it well.

This was the 10mm I was issued....

 

[stratplexi]

I am certainly no expert here but I had always understood that 10mm was the equivalent to the .41 magnum but for a semi auto platform. In pistol length duty weapons or shorter the advantage would go to the 10mm in terms of power when compared to .357 magnum. As barrel length increases, that advantage diminishes and may go away completely in carbines. I have seen some crazy high numbers cited with hot .357s through lever action carbines. Regardless, .357 or 10mm will get the job done with the proper loads and barrel length. I think .41 magnum may offer a little more power and then the mighty .44 magnum if you need more. There are some hot loads for the venerable .45 Colt too. Lots of good options. I just read an article on Gun Digest extolling the versatility of the .45 Colt. As I say, lots of good options.

I really want a 10mm semi auto with a 6” barrel. Might go for a Glock 40 MOS.

 

[Frank Black]

You say I`m cherry picking when I show you a boutique load that surpasses your mighty 10mm. 180 is the standard weight for 10mm and heavy for the 357 magnum.

No, actually a 200gn/.40-cal bullet, JHP or FMJ, is the original standard for the 10mm cartridge ... with '200gns @ 1200fps' being the minimum velocity.

The 180gn load was a concession to the availability of bullets.

A full-power 10mm load for the 180gn weight is in the 1350-1400fps range.

 

[tlawler]

In your photos of the three cartridges, the 10mm magnum case looks a LOT longer that the 10mm case. I'm surprised there is enough extra length in an N Frame cylinder to accommodate that.

It is a lot longer. More than a quarter inch longer, in fact. Whereas the difference between .40S&W and 10mm is only 0.15”

Here’s a picture of a dummy round of 10mm Mag I made next to a regular 10mm.

 

[tlawler]

Note that his AMT semi-auto 10mm Mag pistol had a 8 3/8" barrel, but a good chunk of that measurement included the chamber. So it would be interesting to do a comparative range session with Ruger's 7" 10mm SRH, with its cylinder chambers suitable reamed to 10mm Mag specs, to fire the same loads and see if the same or closely similar velocities would result, other variables being equal.

Does a 10mm SRH also have a long enough cylinder? I’m asking because I’m considering getting one or a newer 6.5 610 with (ugh!) the lock to punch out to 10mm Mag.

 

[Hub]

I am certainly no expert here but I had always understood that 10mm was the equivalent to the .41 magnum but for a semi auto platform. In pistol length duty weapons or shorter the advantage would go to the 10mm in terms of power when compared to .357 magnum. As barrel length increases, that advantage diminishes and may go away completely in carbines. I have seen some crazy high numbers cited with hot .357s through lever action carbines. Regardless, .357 or 10mm will get the job done with the proper loads and barrel length. I think .41 magnum may offer a little more power and then the mighty .44 magnum if you need more. There are some hot loads for the venerable .45 Colt too. Lots of good options. I just read an article on Gun Digest extolling the versatility of the .45 Colt. As I say, lots of good options.

I really want a 10mm semi auto with a 6” barrel. Might go for a Glock 40 MOS.

No, actually a 200gn/.40-cal bullet, JHP or FMJ, is the original standard for the 10mm cartridge ... with '200gns @ 1200fps' being the minimum velocity.

The 180gn load was a concession to the availability of bullets.

A full-power 10mm load for the 180gn weight is in the 1350-1400fps range.

BUFFALO BORE HEAVY 357 MAG
180 gr. JHP (1,500fps/M.E. 899 ft. lbs.)
20 Round Box

Our 357 mag. ammo adds more power than ever before to the 357 Mag. This ammo is safe to shoot in ANY all steel 357 revolver - this includes J-frames. This ammo is no harder on your gun than any other normal 357 ammo.

Tell me how a 180 grain 357 Magnum@1500 fps has less power than a 180 grain 10mm@1350 to 1400 fps.

 

[Autonomous]

I am certainly no expert here but I had always understood that 10mm was the equivalent to the .41 magnum but for a semi auto platform.s.

I really want a 10mm semi auto with a 6” barrel. Might go for a Glock 40 MOS.

The 10mm is closer to a .357 magnum.

Do yourself a favor and take a close look at the Springfield Armory 5.25" 10mm XDM. IMO it handles better than a Glock and does not suffer Gaston Glock's goofy grip angle.
I'm happy with mine and a PRP trigger kit made it even better.

 

[Loyaljeeper]

Does a 10mm SRH also have a long enough cylinder? I’m asking because I’m considering getting one or a newer 6.5 610 with (ugh!) the lock to punch out to 10mm Mag.

That shouldn’t be a problem for the SRH or 610. The GP100 is another story though.

 

[Mike_Fontenot]

This was the 10mm I was issued....

Not what I had pictured. I assumed you were issued a 10mm sidearm.

 

[tlawler]

That shouldn’t be a problem for the SRH or 610. The GP100 is another story though.

I checked the cylinder length of my 610 no dash and compared it to what’s listed in the SCSW. It’s listed as 1.57” and mine came in at 1.573...close enough. I checked 2 .41 Mag N-frames, a 57 no dash and a 657-3. The 57 is 1.743” (1.75”SCSW) and the 657 is 1.678”(1.67”SCSW), so there is a good variance in the different calibers. I wonder if there is a similar variation in different calibers in the SBH? Does anyone have these measurements?

 

[stratplexi]

The 10mm is closer to a .357 magnum.

Do yourself a favor and take a close look at the Springfield Armory 5.25" 10mm XDM. IMO it handles better than a Glock and does not suffer Gaston Glock's goofy grip angle.
I'm happy with mine and a PRP trigger kit made it even better.

Will take a look at the XDM...I am not in a hurry and will wait until pricing and inventory improve. Not to mention, I bought 5 or 6 guns in the last 6 months or so...lol.

 

[oldman10mm]

I did some quick measurements, 610-2 vs 57 no dash.
-Cylinder length 610-2 1.580" 57 1.719 57-.139" longer
-Forcing cone protruding from frame 610-2 .184" 57 .133" .051" shorter forcing cone protrusion into frame opening for the 57
-Frame space 610-2 1.873" 57 1.880" basically same opening

-57 cylinder recessed for cartridge rim.
-610-2 has to allow a space at rear to allow for moon clip and cartridge rim.

 

[Loyaljeeper]

BUFFALO BORE HEAVY 357 MAG
180 gr. JHP (1,500fps/M.E. 899 ft. lbs.)

You had me wondering. Buffalo Bore states those velocities are in a 16” carbine. Out of a 4” revolver they are standard velocity. They stated these loads are a little too long for some sp101s.

I was thinking I had found the prefect woods carry for a 686 plus.

 

[Hub]

You had me wondering. Buffalo Bore states those velocities are in a 16” carbine. Out of a 4” revolver they are standard velocity. They stated these loads are a little too long for some sp101s.

I was thinking I had found the prefect woods carry for a 686 plus.

Item 19L
➤ 1,258 fps -- S&W model 66-4, 2.5-inch
➤ 1,351 fps -- S&W model 65-5, 3-inch
➤ 1,356 fps -- S&W Mt. Gun, 4-inch
➤ 1,501 fps -- Ruger GP 100, 6-inch
➤ 1,840 fps -- Marlin 1894, 18-inch

 

[Hub]

You had me wondering. Buffalo Bore states those velocities are in a 16” carbine. Out of a 4” revolver they are standard velocity. They stated these loads are a little too long for some sp101s.

I was thinking I had found the prefect woods carry for a 686 plus.

BUFFALO BORE HEAVY 357 MAG
180 gr. JHP (1,500fps/M.E. 899 ft. lbs.)
20 Round Box

ITEM 19L

 

[Frank Black]

Does a 10mm SRH also have a long enough cylinder? I’m asking because I’m considering getting one or a newer 6.5 610 with (ugh!) the lock to punch out to 10mm Mag.

Yes, the cylinder chambers of Ruger's 10mm SRH are long enough to be reamed out to 10mm Mag length. Same with the S&W 610.

 

[BLUEDOT37]

I had assumed that most of the extra performance was due to a higher max pressure.
That must mean that the extra power comes from having room for a lot more powder in the case.
(A better way to put that is that, if the max pressure is the same, the only way the bullet velocity or energy could be substantially higher is if the high pressure lasts for a longer time of bullet travel).

Yes, of course, more powder, more hot gases, more velocity, same pressure.
(The 10MAG has ~33.1% more case capacity than the 10Auto, in Starline cases)

The pressure can only last as long as the barrel is but the higher volume of gases have more force behind them.

It would be like if you stroked your small block but kept the compression ratio the same. You'd have more air/fuel to burn which would increase your performance.

.

I don't know why it's being questioned if the 10MAG can fit in a 610's cylinder? People have been doing it for years.

.

The 610s don't get every Endurance Package feature that the 41 & 44 Mags get though. No bolt block, but none of the other N-frames (357 or 45s) have it either.

I've never had any issues with mine & twice now when I was shooting my full load 10MAGs at the range a neighbor lane asked if that was a 44 Magnum I was shooting.

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