Un-Supported Cases??

[Finsterino]

While working up some high performance loads, I see some folks have problems with their barrels not fully supporting their cases (other pistol brands, like glock).

One man said that if more than .080" of the head (in front of extractor groove) was un-supported, you were in deep do-do as far as shooting hot loads.

So I got my caliper and tried to measure the un-supported case length on my Match, and even at the extractor cutout, it was zero. OK, maybe 10 mils at the most.

So, in other words, this barrel provides 100% steel support around the 10mm case. Should handle hot loads very well.

FWIW

Dave

[SLM crew chief]

Is this a question?  New, unfired brass will/would be just fine in the Glock or other unsupported guns, even with hot loads.  I read many gun forums and the biggest problem was with the Glock in .40 S&W.  They rushed to get a gun to market and basically just turned a 9mm into a .40.  One company who did it the other way was Styer.  They built their .40 then built their 9mm off that.  Anyway...... If you are talking about a 10mm gun, you are good to go.  I don't think I've read anywhere about any company just "overboaring"  to make a 10.

[Finsterino]

This is just a FYI post. I was just pleased to see that the witness  10mm match barrel offers full case support. I don't know about the octaganol barrels.

[ReloaderFred]

The polygonal rifling is supposed to give a little higher velocity, but is tempermental if shooting lead bullets.  If you do decide to shoot cast bullets, be sure to clean the leading, if any, out regularly.  It seems the polygonal rifling leads faster than conventional rifling and builds pressure faster.

Hope this helps.

Fred

[EZ CZ75]

I actually ended up shooting hot reloads in my glock 22 before I ran across the unsupported thing.  I never experienced any problems and all the brass is still in use.  I did sell my glock for a 40P just cause I like it more, but the brass has been reloaded a few times with nary a hint of stress.

So far all I have heard about the glocks has come from second hand experience.  Has anybody actually had a problem with the glock 40 or it's brass?

[robertbank]

Porland Police switched from the Glock 40 after a kaboom or two.  I have seen pictures posted on the net and the guns were not pretty.

The Federal Fishery boys up here shoot the Glock 40 and I have recovered brass from their shoots.  all the brass I picked up has a slight bulge at six o'clock at the base where the case was unsupported.  I thinks things get real interesting when pressures rise due to leading.  If I had a Glock 40 I would be shooting jacketed only or buy an aftermarket barrel with standard rifling.

Take Care

Bob

[ReloaderFred]

I carried a Glock 22 for most of the last two years before I retired.  All the brass from our department's guns displayed the "Glock Bulge", and we only shot factory Winchester ammunition through them.  The unsupported chamber isn't the best design to come down the pike.  The Glocks also have a "generous" chamber to facilitate feeding.

The Oregon State Police carry Glock 22's, and the brass from their guns display the same bulge.  They shoot Speer ammunition exclusively.

I generally throw brass from Glock firearms in the recycling box, since there is so much other brass available.

Hope this helps.

Fred