.40/10mm Hornady sizing die cutting brass

[VrockTDSaz]

Anyone ever had this problem or know the cause. It's one fired brass from Armscor fired from a Glock 20sf. The Hornady sizing die is putting a sharp ridge right at the case head. The ridge goes about 3/4 of the way around.

 

[rcmodel]

Bulged brass from high pressure loads in a loose chamber.

Then, a sharp edge on the carbide insert? or whatever it is Hornady puts in their sizing dies?
(titanium nitride “gold ring” finish)

I gave up on them working right and not wearing out too soon many years ago.

You can buy a Lee or Redding 'Bulge Buster' and run them through that first?
To get rid of the bulge before sizing.

http://www.midwayusa.com/product/35...e-sizing-die-kit-40-s-and-w-357-sig-10mm-auto

http://www.midwayusa.com/product/882261/lee-bulge-buster-base-sizing-kit-380-auto-40-s-and-w-45-acp

Or, you can send the die and some unsized cases & sized back to Hornady ald let them fix the die?

Or both?

rc

 

[lindy]

The brass may have been fired in a gun with an un-supported barrel (Glocked) and that
crease is formed when You try to Iron out the Bulge with Your sizing die.

Good shooting

Lindy

 

[gamestalker]

Ya, that's a classic example of brass fired from a loose or poorly supported chamber, and then run through the wrong die for the job. A bulge buster die should prevent that condition, but it doesn't help much in terms of case life. Subsequent resizings of brass bulged like this becomes weakened, so a premature blow out is usually imminent.

I recommend buying an after market barrel to extend case life, Wolf is good.

GS

 

[fiftybmg]

The resizing die is doing it's job.

Can you run some new Armscor brass through the die and compare the pictures ?

If you don't have any, pull a few rounds just to test.

 

[VrockTDSaz]

I have the Lee Bulge Buster, these rounds didn't look that badly bulged so I just went for it with the sizing die. Non-bulged cases are still looking a little "scrapped" if that makes sense (kinda like the one on the far right). My plan is to run some un-fired through tonight along with some once fired that I ran through the Bulge Buster and see how they turn out. I'll post the pictures of both to compare. I'll post more picture around 7:00pm AZ time.

 

[Walkalong]

Try not sizing them quite as far down. it might help.

 

[VrockTDSaz]

Ran about 10 through the bulge buster first and they came out fine. Though, I can't understand how a bulge in the case causes an indented line at the case head. But, that seems to be exactly what it's doing.

 

[VrockTDSaz]

Try not sizing them quite as far down. it might help.

That works also. The Glock chamber is pretty generous, so I don't really need to size that far down.