Bulging 10mm Brass

[Lone_Gunman]

I reloaded some 10mm as follows:
Unfired Federal Brass
Federal large pistol primer
200g TMJ
6.2 grains of Unique.

This was giving me velocities of about 950 fps out of a Glock 20. I noticed on spent cartridges there is some slight bulging about an eight to a quarter of an inch in front of the case head.

Am I getting too much pressure with this load?

If I am going to load hot 10mm to shoot out of Glock 20, would it be smart to switch to a Bar Sto barrel for more support?

 

[ElKabong]

Yep....even factory ammo bulges in a stock barreled Glock.
Get a supported aftermarket barrel so you can shoot lead bullets too.
I have a 1006 Smith and really love the caliber.

ElKabong

 

[EddieCoyle]

If you're going to keep the stock barrel, get yourself an EGW undesized sizing die. That'll squash them back into shape. I'm guessing that you will experience shorter than normal case life though.

 

[Lennyjoe]

We call that glocksmiles. Due to the known lack of chamber support especially in the higher pressure 10MM round, most of us G20 reloaders buy an aftermarket barrel.

I went with the Storm Lake stainless barrel and it works great. Have pushed the limits and the brass comes out with little to no pressure signs.

I suggest you drop into www.topglock.com and check out the Storm Lake barrel. Won't break the bank like barsto will and is just as good in quality. At $98 you can't go wrong. Your brass will love you for it.

http://www.topglock.com/catalog/barrels_stormlake.htm

 

[Harley Quinn]

Lennyjoe

I have been looking for a 357 sig barrel to go into my mdl 22 4.5".
I have a 6.5" and it shoots great. I got it off e-bay (6.5"used) funny paid quite a bit when I look at the prices that are on the Top Glock site...
Thanks for the information. It was under the prices but it was used, not new... I was lucky.

But I am going to have to get a new spring and guide for the 85 grain Frangable stuff, just to heavy of spring in the 22 for it to work correct. I am going to try my mdl 17 spring and guide, a quick switch just to see if it has to be lighter or not. I figure it will be fine since I'll be shooting 85 to 147 ammo same as the 9mm stuff.

I contacted Glockmeister to find out the correct one as far as weight goes. They got back to me but no information, said call.
I also got a number for lonewolf barrels, I like there etching.

Someone mentioned that the newer after market are better springs because they are not crushed to there limit and give a better feel and quicker action??? I'll have to check it out some more.

HQ

 

[Lennyjoe]

I prefer Wolff springs over any other. Also, I use a Glockmeister steel guide rod instead of the factory one.

Wolff offers spring sets for the Glocks that you can toy around with to see which one works best.

For my G20 the 22lb spring works best with all my reloads except the 800X nuclear loads. For that I go with a 24lb spring.

 

[HSMITH]

How many times are you going to load that brass? If the answer is less than 10 then shoot on and be happy. The load you are using is VERY sedate, and should go 20+ loadings in the factory barrel. Even very hot loads will go 10 loadings with no problems at all in the factory barrel. I stopped trying at 20 loadings on a batch of 40 brass that was loaded a little hotter than what you will find in print, the sample size was only 100 cases, and a few got lost in the test but it made me feel better. I did another 20 loading test using the EGW U-die, lots of guys will tell you it overworks the brass and hardens it. Well, with the 25 cases I used I couldn't make one fail even with nearly 10% over book loads. The extractor hurts the brass a lot worse in a hot loaded Glock than the chamber dimensions ever will.

Make SURE you don't load FC marked Federal brass, some of it blows on the first loading even with very light loads, and it will ALL blow sooner or later. Crunch it and throw it away if you see FC on the headstamp.

 

[Lone_Gunman]

The brass in question was unfired Federal brass.

Whats wrong with Federal brass?

 

[HSMITH]

Nothing wrong with Federal brass that is marked Federal. The Federal brass marked FC is VERY thin near the web. Federal bought a lot of guns and repairs in a short period of time and redesigned the brass in 10mm and 40. They changed the headstamp from FC to Federal on the thicker brass.

 

[Lennyjoe]

Yep, I try to stay away from the FC brass as well. Starline is the way to go for 10MM