The Mighty 10MM!

[cid`]

Lowly peasant here, so far, G20g4 and G29g4. I purely reload but nothing serious yet, full power 800X and HP38's are pretty snappy.

Read somewhere that underwood does 800x case full's to achieve their velocities.

[GW]

Yeah a Police Supply, law enforcement only store...

Well, not completely.
They do honor GSSF cards there but only for rostered Glocks.
And their service is polite to us non-LEO's as well

[igorts]

Lowly peasant here, so far, G20g4 and G29g4. I purely reload but nothing serious yet, full power 800X and HP38's are pretty snappy.

Read somewhere that underwood does 800x case full's to achieve their velocities.

[cid`]

igorts,
Awesome! Will try that out next time I load another batch.. 800X has been a challenge, gonna try what stilly mentioned, some dildo from his collection to help settle/drop the powder.

[igorts]

The Mighty 10MM!

I have some Swamp Fox loads. He used longshot powder, 10.6grn for
Muzzle Velocity: 1340 fps
Muzzle Energy: 717 ft. lbs
Beating underwood ammo.
Use caution on those loads. Real 10mm power

[Bill Steele]

I have some Swamp Fox loads. He used longshot powder, 10.6grn for
Muzzle Velocity: 1340 fps
Muzzle Energy: 717 ft. lbs
Beating underwood ammo.
Use caution on those loads. Real 10mm power

If you are still talking about 180gr jacketed style bullets, that is an EXTREMELY HOT load. If you are shooting out of a stock Glock chamber, unless you have extensive reloading experience with loads in the twilight zone, leave this one off your list.

[Ronanld]

I use 9.4 gr of LongShot with a 180 gr bullet. I would work up very slowly from there if I was inclined to use that 10.6 gr load, which I am not. Hot loads strain the gun and punish the shooter for no good reason. I am a huge 10mm fan and enjoy shooting 50-75 rounds without getting beat up.

[igorts]

The Mighty 10MM!

If you are still talking about 180gr jacketed style bullets, that is an EXTREMELY HOT load. If you are shooting out of a stock Glock chamber, unless you have extensive reloading experience with loads in the twilight zone, leave this one off your list.

Its not my load but Swamp Fox's.
He passed away, but he was famous for hot loads.
I got a spread sheet with some factory and custom loads for mighty 10mm.
Not recommended for beginners

[JTROKS]

I used to hotrod my 10mm handloads. I've bulged some brass on first firing, but no kabooms or broken guns. I would start by finding out the longest COAL for my magazine and then load up some test rounds if they will feed through the mag and reliably feed into the chamber. I used HS7, AA7 and AA9. With my 7" barrel long slide Javelina reaching top velocity is easy. I had fun doing it, but in the end my 44 magnum is still king. I just settled for warm loads when I carried my 10mm during hunts.

[Bill Steele]

Its not my load but Swamp Fox's.
He passed away, but he was famous for hot loads.
I got a spread sheet with some factory and custom loads for mighty 10mm.
Not recommended for beginners

I understand. In my stock G20's (with a 22lb ISMI recoil spring), I get 1300fps from jacketed 180gr bullets, loaded to 1.260" OAL, with 9.8gr of LS. I have gone as high as 10gr, but the extractor rash starts getting pretty bad at that level and I am not seeing significant velocity increases, maybe another 10fps average. 10.4 is really pushing the envelope. Guys wanting to go there really should include an aftermarket barrel like a KKM to give your cases as much support as you can and work up slowly inspecting each and every case.

[igorts]

True. I switch to aftermarket barrels with full support right away. Saves from bulged cases in oem Glock barrels

[Bill Steele]

True. I switch to aftermarket barrels with full support right away. Saves from bulged cases in oem Glock barrels

Good practice when loading very hot. It really does add an extra margin of safety.

Out of my stock Glock chambers, anything over about 1250fps with 180gr jacketed, I have to use a G-Rx pass through die if I want subsequent reloads to chamber in my tighter chamber 10mm barrels (1911's, AM barrels, etc.).

In the end, 180gr XTP going 1150fps will have devastating terminal ballistic performance for anything animate in North America.

[Army GI]

I've always been intrigued by the 10mm.

When I first got into guns in the late 90s, I thought the 45ACP was the end all be all of powerful semi automatic handguns. Desert Eagle 50AE and similar were not practical.

But when I learned of the 10mm, by bias of the venerable 45ACP blinded me to thegreatness of the 10mm. Its the most powerful pistol cartridge thats practical in a semi automatic handgun. My next handgun purchase will be a Glock 20 in 10mm. My cartridfe will be the 155gr loading from Underwood Ammo for 800 ftlbs of muzzle energy. More than twice as much energy as the 45ACP

[motoman96]

There's a brand new glock 20 on armslist for 495...

http://www.armslist.com/posts/4622053/sacramento-california-handguns-for-sale--glock-20-fs-10mm--unfired-in-box

[Oceanbob]

Good practice when loading very hot. It really does add an extra margin of safety.

Out of my stock Glock chambers, anything over about 1250fps with 180gr jacketed, I have to use a G-Rx pass through die if I want subsequent reloads to chamber in my tighter chamber 10mm barrels (1911's, AM barrels, etc.).

In the end, 180gr XTP going 1150fps will have devastating terminal ballistic performance for anything animate in North America.

Agree ^^^^^

This is great advice for you potential reloaders that want to push the envelope.

With 10MM its all about pressure. I remember in the "reloading Club" over at Glock Talk in the early days in 2003 with Mike McNett (owner Doubletap) and the importance of aftermarket barrels with better case support. Later Mike Willard (who passed in 2011, RIP and his ammo SwampFox)....in those conversations was Kevin, who started Underwood Ammo with his first offering of 10MM that was hot, yet had safe pressures. A real nice guy as well.

I felt that SwampFox ammo was potentially dangerous when some members had total case separation and fractured frames...

Bill Steele is right about the danger of pushing the envelope above 1300 FPS. Adding more powder doesn't increase velocity but does add more pressure into the danger zone. It's a bell curve folks. You can reach a comfortable 1275 FPS without going over pressure and for this I personally use Longshot because it meters much better than 800X which is like trying to meter dead worms....haha.

Don't forget that another way that is safe to add Feet Per Second is to add barrel length. Shooting 10 from a 6 inch or 9 inch barrel will get you to the promised land.

So, yeah. Get an aftermarket barrel if you're going to reload for high velocity.
The reason is case support.

Hi pressure that is dangerous looks like this. That's a normal Starline case on the right.



The Glock barrel on the right has a smile curve and the chamber is .007 thousandths of and inch Wider. This is fine for function, but hot loads will expand the case to the chamber wall and that case will have to be resized full length to operate in a non Glock barrel.

The KKM on the left has a shallow smile curve and a tighter chamber. These work well, however tighter and less 'ramp' can cause feeding problems. So it's a compromise.



Be safe my friends. Always wear proper safety glasses and gloves when shooting. Especially 10MM. I know plenty of people who didn't lose an eye and still have fingers because they followed these rules.

Be well

Bob