How many times do you reload your shells?

[Truckdrivingman]

It's a case, not a shell.  Shot guns shoot shot gun shells.  Not saying this to be a dick but I wouldn't want you to go on using the wrong terms.

Not familiar with the Glock 20 but if it has a supported chamber the brass life will be like any other round you reload for.  If the brass is not over worked, i.e. resized too small and then expanded in the chamber to be resized too small again, you can get plenty of cycles out a case.

Are you working up loads or are you starting with store bought/factory ammo?

Either way, mic the brass at the head and watch for bulging.  If the case starts to swell just above the head, that will tell you whether your case/chamber has decent support.  Otherwise reload until you see a few mouths split.  You can check finished rounds by pressing the bullet onto a hard surface and rotating the round.  If the head has a crack it will be come apparent.

Hi Earl
I never used factory ammo in my Glock. As a matter of fact, I shot one box(100 reloaded rounds with new brass) til now, since I have the Glock for 2 weeks. I began with 9gn, minimum is 8.6, max is 9.9, due to loading table. I had noticable bulges, but no mouth splits. Resizing was no problem, the shells/cases look good, as far as I can evaluate that.
And the shell/case issue: why are these http://leeprecision.com/shell-holders/ referred to as "shellholders"? I just ask, I'm not a native speaker

[The_Shadow]

If you want to use VV N-105, you may want to study what these guys did with it from their pistols.  I know you're new to handloading the 10mm but there is info to learn from their work. Working with a chronograph and working upwards you can observe how your results compare.  This is the link for GT vihta-vuori powder http://www.glocktalk.com/threads/vihta-vuori-powder-data.203164/

[nickE10mm]

Since I started reloading I have used "primarily" aftermarket / fully-supported [sic] barrels and have loaded at least 1000 pieces of my brass nearing 20 times.  I toss them out when they get real beat up, lose tension in primer or case mouths, or develop smilies or bulges I don't trust.... or if their OAL changes too much .... if a case keeps looking good, doesn't exhibit any of the "signs" and I don't lose the dang thing.... I'll keep reloading it until it splits, at least in target level stuff.  No reason to throw it out just because it makes it to some arbitrary 'number'....

Stay safe!

[gandog56]

I am pretty much shoot them till they split.

[gehlsurf]

While I haventered reloaded too much, because like you, I'm new... I can say thus though, Starling brass seemeS to produce a much better finished product, more than using SIG brass or others (forgot which others now, haha).  The other brass seems to bulge more if bullet seating isn't perfect, etc.  I use the Lee Factory Crimp Die as well, and with Starline, they always come out factory/perfect looking!!  I bought it off midway, try some, I think you'll get what all these guys are always saying about Starline, it never made much sense to me until I got some

[cgreth]

I shoot them until they split.   I run all my 10mm brass thru the Lee Bulge Buster before reloading.   Anything that is excessively hard to push thru that, gets dumped.   Probably see that about 1 in 300 rounds. 

[gandog56]

While I haventered reloaded too much, because like you, I'm new... I can say thus though, Starling brass seemeS to produce a much better finished product, more than using SIG brass or others (forgot which others now, haha).  The other brass seems to bulge more if bullet seating isn't perfect, etc.  I use the Lee Factory Crimp Die as well, and with Starline, they always come out factory/perfect looking!!  I bought it off midway, try some, I think you'll get what all these guys are always saying about Starline, it never made much sense to me until I got some

I have a bag of 100 brand new Jagemann 10mm brass I haven't loaded yet. I will be interested to see how many times I can reload it as it was not that expensive.

[PCFlorida]

I am pretty much shoot them till they split.

Me too

[gandog56]

I have some .38 special cartridges I have been reloading for over thirty some years, probably at least 100 times. It is my special .357 magnum practice ammo. Of course I load them very very light. Like 2 point something grains of Red Dot powder and a 148 grain cast lead DEWC. When I go to the range I will shoot like 1 box of full power jacketed .357 magnum rounds, just to make sure the sights are right for them, then 2-3 boxes of the practice ammo. I rarely get any splits on the .38's. Not like the .357 magnum full load brass.

[robert4]

Lost brass with a 10mm? Never! It's not lost, it's relocated to zip codes unknown!

Zip codes became soldiers... autocorrect is killing me.

  Took my new Sig 220 10mm to an outdoor range to fire the first rounds a few days ago. Only found 4 of the 45 AE 180 factory load brass. Fired 145 mixed reloads at an indoor range a few days after that. The range guys there are great about saving my brass and swept up all but 6 pieces of brass. Turns out they said the ejection pattern was very consistent. I was in the 4th lane from the entrance. The ejected brass was bouncing off the partition in my lane, then landing 4 lanes to my left, often hitting the entry door before landing in a corner.