Resizing 10mm Brass

[41special]

Have a ongoing issue trying to run reloaded ammo in my S&W 2.0 that had previously been shot in my Glock 20. The unsupported barrel will leave a enlarged ring just forward of the extractor groove that the sizing die can't reach. This is with ammunition loaded up near the maximum loads in my manuals.

Was going to invest in a specific die to remove that, but now think I'll just segregate the brass from the 2 guns, as resized Glock brass runs fine in the Glock. I run PPU, Sig and Starline brass as I've found these 3 brands to be to my liking. The Smith & Wesson chamber must have somewhat tighter dimensions.

Thoughts ?

41

 

[Mike0251]

Commonly referred to as the Glock bulge (google it) due to the unsupported barrel. Most dies will not reach far enough down to eliminate that. I reload 9mm and 40 range brass but I rollsize all the brass including 10mm. This eliminates that issue all together. This is not a cheap tool but we shoot competition and go thru 500+ rounds a month. So it was essential for me to invest in it. Prior to with unknown range brass nothing but trouble as you have discovered.

 

[SSBiggun]

I just leave my Glock brass where it lay. But I recover all other for re-use. Been an ongoing issue since i started loading 10mm back in 1995.

 

[Classic29]

Look into the Lee Bulge Buster Kit.

 

[41special]

Look into the Lee Bulge Buster Kit.

I did, but Lee clearly states that their die will remove the bulge but the weak spot remains a weak spot even after the die presses it out. And it's prone to fail at that spot.

So currently I'm unsure what to do with my Glock 20 brass. With my high performance bear ammo, leaving it on the ground might be a good option as SSBiggun stated.

41

 

[41special]

Commonly referred to as the Glock bulge (google it) due to the unsupported barrel. Most dies will not reach far enough down to eliminate that. I reload 9mm and 40 range brass but I rollsize all the brass including 10mm. This eliminates that issue all together. This is not a cheap tool but we shoot competition and go thru 500+ rounds a month. So it was essential for me to invest in it. Prior to with unknown range brass nothing but trouble as you have discovered.
View attachment 757430

I've never even heard of that type of resizing.

 

[Mike0251]

It does not resize, it brings the case back into spec. Then I resize/reload.

 

[ultratec00]

Is there an aftermarket barrel that has a supported chamber?

 

[SSBiggun]

I have a Vector Uzi and open bolt advanced primer ignition sub-guns often bulge brass. I bought a push through condition die for 9mm and tried for awhile but it's a pita. The machinest that made it also had them for. 40 S&W and 10mm but you had to lube it with synthetic transmission oil and I pretty much gave up. It was just too much work for the end gains.

 

[78bagger]

My Delta Elite does the Glock bulge thing. I tried the Bulge Buster but they're right, it leaves a weak spot. I'm resigned to downloading my range ammo and carrying full strength. Every once in a while I go down the rabbit hole again and consider sending the 1911 off to be fitted for a Kart barrel with full support but this requires notching the frame and yada yada yada. I end up talking myself into looking for a new 10mm with a fully supported chamber

 

[41special]

Is there one?

Even the KKM barrel for the Glock look slightly unsupported to me.

Better than a factory barrel, but fully supported? I'm not too sure & there $200

 

[Tom Beavert]

Please don't leave your brass on the ground at the range, it's just rude.
Tom B

 

[A-300 Dave]

I encountered this same problem when reloading range brass for my S&W M&P 2.0 .40 cal. I bought the RCBS "Push Thru" resizing die. Adds another step to the process, but no more bulges and no weak-spots - End of problem

 

[Dvus]

Both of my Delta Elites bulged brass bigger than my old man belly, so I was afraid to shoot them. I bought a Witness Hunter and a Rock Island Tac Ultra and both have fully supported barrels. Problem solved.

 

[M29since14]

I don’t think any sizing method restores 10mm brass to any sort of condition I want to use with full power 10mm loads. I use the Lee push through die and it is fine, for what it is, but I don’t use the brass for anything except target loads (180s at ~1150 FPS). For full power loads I use new 10mm brass, but I don’t shoot enough of those to worry about. I am not a metallurgist and have no proof, but my theory is that once the brass is bulged to an easily noticeable extent it is not restored to “spec” simply by pushing in the bulge. Maybe I am too cautious?

 

[stansdds]

Bulged brass will still be weakened brass, even if the bulge is completely removed. This is due to work hardening, something that happens to metal when it is bent or deformed, then reformed to remove the defect. The same thing happens to case mouths that are repeatedly expanded and crimped.

 

[Classic29]

Is there an aftermarket barrel that has a supported chamber?

KKM is what I have for my 20. Some spicy loads and no pregnant brass. I also use a 24 lb recoil spring. As for using Bulge Buster sized brass, it’s used for plinkin’ loads. I use only brand new Starline brass for my high performance stuff.

 

[Classic29]

Is there one?

Even the KKM barrel for the Glock look slightly unsupported to me.

Better than a factory barrel, but fully supported? I'm not too sure & there $200

You’ll most likely never get a “fully supported” chamber for any semi-auto. You need a bit of clearance on the bottom for functioning. Only a revolver will provide that. That said, I haven’t had a problem with my KKM barrel and 24lb spring setup. New brass for full power then Busted and then used for plinking loads. YMMV.

 

[Doriangray6]

It does not resize, it brings the case back into spec. Then I resize/reload.

How much was shipping from Australia?

 

[Mike0251]

How much was shipping from Australia?

Bought it in the USA. Double alpha.

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