40 Caliber Loads in 10mm Brass

[roc1]

How many of you have loaded 40 caliber loads in 10mm brass? Any issues? I know you can do this just like loading 38 special loads in 357 cases but does it creat any problems? Wanted to load lighter target loads is reason.
Thanks
Roc1

 

[Walkalong]

Should work great, at most you might need a tenth or two to make up for the larger case, but it isn't much to make up.

 

[.455_Hunter]

You might have to increase charge size a small amount to compensate for the larger case volume, but there shouldn't be any undo difficulty.

 

[mcb]

No issues, might get a slightlower velocity than published due to greater initial case volume but should work fine.

 

[.455_Hunter]

All saying the same thing at the same time.

 

[roc1]

Thanks for help that’s bkind of information I thought was right but wanted some more insight
Thanks
Roc1

 

[AJC1]

Thanks for help that’s bkind of information I thought was right but wanted some more insight
Thanks
Roc1

You may have function issues on the low end unless you reduce the main spring power. Testing will sort this out.

 

[roc1]

Thought about that have lower spring weight already went to heavier one slow brass slinging down a bit
Thanks
Roc1

 

[Virginia Jim]

My question is - Why?

 

[Lennyjoe]

I’m assuming he doesn’t want to take a beating during longer range sessions by shooting full power 10MM loads so wants to water them down a bit while still shooting the same platform.

 

[GarrettJ]

Keep in mind, several factory 10mm loadings give the same ballistics as .40 ammo. (When I shot some 180 Hydra Shock ammo over the chronograph, the 10mm version in a G29 was only 18 fps. faster than the .40 in a G23). Most guns seem to run just fine, whether shooting the full-powered stuff, or the "10mm Lite" loads, and without having to mess with recoil springs.

I played with a Colt Delta Elite in USPSA Single Stack one summer. I had intended to have a .40 barrel fit to the gun, but never got there. So I just loaded 10mm brass to make Major Power Factor, same as if I'd been loading .40 ammo. For this I used some 165 gr. Extreme bullets with 6.2 gr. of Win 231, which gave a velocity of 1062 fps. in that gun. I had put a lighter spring in the gun, but I've run those in another Colt Delta with the factory dual spring setup and they cycle that one with no issue as well.

If you want some light loads, pull out a reloading manual and pick some of the starting loads with one of the faster-burning powders and see if they will run in your gun. If not, bump up the load a bit or try a slightly slower burning powder.

 

[ahutch71]

I have a heavy 22lb spring in my G20 and have an Alphawolf .40 barrel. Haven’t had any issues with 40cal cycling the action with the heavier spring. Avoiding limp wrist is crucial with that spring, but as I said I haven’t seen any problems even with moderate 40cal loads. I figure downloaded 10mm would behave the same way and cycle even with a heavy spring, but would need to do some testing to confirm.

 

[Palladan44]

You can load 10mm even lower than 40 S&W (factory powered) if you wanted. I had to out of necessity using Berry's plated bullets that started to keyhole at 1,100 fps (180gr bullets)
My large framed, 6" Glock 40 MOS is a joy to shoot with the lower velocity rounds, and is an excellent tack driver. Also, there is no bulge to the brass at this power level, another advantage to the loading process.
I DONT use the usual powders id use for 10mm full powered loads such as Blue Dot or Longshot,or even Power Pistol or BE 86 for that matter....
My old stand-by WIN-231 or something similar does just fine.

 

[cfullgraf]

In a semi-auto, be prepared for cycling issues with 40 S&W level loads in a 10mm gun. Maybe yes/maybe no.

There would be no issues in a 10 mm revolver such as a S&W 610.

As a side note, shooting 20-30 40 S&W rounds in my 610 puts enough carbon in the chamber that 10mm cartridges would not chamber. Nothing that a good cleaning won’t solve.

This is the first revolver that I have experienced this in even though it is always talked at in length for shooting 38 Special in a 357 Magnum gun.

 

[mcb]

In a semi-auto, be prepared for cycling issues with 40 S&W level loads in a 10mm gun. Maybe yes/maybe no.

There would be no issues in a 10 mm revolver such as a S&W 610.

As a side note, shooting 20-30 40 S&W rounds in my 610 puts enough carbon in the chamber that 10mm cartridges would not chamber. Nothing that a good cleaning won’t solve.

This is the first revolver that I have experienced this in even though it is always talked at in length for shooting 38 Special in a 357 Magnum gun.

That must be a filthy 40S&W load, I have put will over a thousand rounds of 40S&W through my 610 and the drop a moonclips of 10mm in without issue.

I did load 40S&W loads in 40S&W brass but loaded to 10mm over all length using 200 gr bullets, got a noticable bump in accuracy in my 610.

 

[Soonerpesek]

How many of you have loaded 40 caliber loads in 10mm brass? Any issues?

Heavier bullet (220gr) and a fast powder (Alliant Sport Pistol, W231)...
Kinda like pushing heavy 147gr 9mm.....More of a push rather than a snap......( suppressors like it better also...).


ETA....Holy smokes, didn't realize this thread was a year old...!

 

[cfullgraf]

That must be a filthy 40S&W load, I have put will over a thousand rounds of 40S&W through my 610 and the drop a moonclips of 10mm in without issue.
.

It is quite possible that the 40'S&W ammunition was loaded with some "dirty" powder. I'd have to look it up and see. I forget off hand what the powder may have been.

I wanted to consume the 40 S&W rounds and my son-in-law from the he UK was in town so it was an opportunity to have some fun and use up the 40 S&W rounds.

I normally use cases in revolvers that the revolver is chambered for. So, in the future, the M610 will only shoot 10mm cases. The 40S&W cases will be saved for my 40S&W semi-auto pistols.

 

[mcb]

It is quite possible that the 40'S&W ammunition was loaded with some "dirty" powder. I'd have to look it up and see. I forget off hand what theowder may have been.

I wanted to consume the 40 S&W rounds and my son-in-law from the he UK was in town so it was an opportunity to hhave some fun and use up the 40 S&W rounds.

I normally use cases in revolvers that the revolver is chambered for. So, in the future, the M610 will only shoot 10mm cases. The 40S&W cases will be saved for my 40S&W semi-auto pistols.

My 610 was my USPSA competitors revolver. I have put roughly 20,000 rounds of 40S&W through it over a ~7 year period in competition. Yet ever winter I would switch to 10mm for deer season. I never cleaned the cylinder more that a few drops of CLP and one or two pulls through of a bore snake. Use decent quality ammunition and the carbon ring is a non-issue.

I knew guys that ran 40S&W in their Glock 10mm and would make the switch back to 10mm similarly easily. No barrel change 40S&W in the 10 mm barrel.

 

[Mark_Mark]

here’s a idea! 10mm 300 grain going 1,000 fps, right under sonic speed.

 

[SingleActionAndrew]

here’s a idea! 10mm 300 grain going 1,000 fps, right under sonic speed.

I like it. Might not open the JHPs but should be proper penetration with a slug on thick skinned game at closer distances

 

[mcb]

A 300 gr .400 diameter bullet with a simple truncated-cone nose would be nearly .9 inches long. 10mm Auto's max OAL is only 1.26 and you got to have room for the case head and powder charger. I like heavy for caliber bullets but 300 gr might be pushing it in 10mm Auto. In a Revolver and/or 10mm Magnum it becomes more tractable but in a semi-auto I don't think you got the room to get it it out the barrel let alone close to 1000 fps.

 

[AK Hunter]

I load 90 to 100 gr bullets from pulled .380 rounds in my girlfriends 9mm all the time she just thinks she is getting to be a better shot. LOL

 

[Mark_Mark]

I like it. Might not open the JHPs but should be proper penetration with a slug on thick skinned game at closer distances

and Suppressed too!

 

[Mark_Mark]

I load 90 to 100 gr bullets from pulled .380 rounds in my girlfriends 9mm all the time she just thinks she is getting to be a better shot. LOL

that’s my favorite load man! and don’t forget a nice crimp too! I’m cycle my 95 grain 9mm load 20-30-40 times and the bullet stays in place