I don't think it matters. I unchamber and rechamber the same cartridge everyday for weeks, sometimes months, and it fires just fine when I finally fire it at the range.

What exactly would "setback" the bullet?

 

I here that by doing that it is dangerous and the bullet could explode in the gun becuase the bullet is pushed back in the case to far to release.

 

I here that by doing that it is dangerous and the bullet could explode in the gun becuase the bullet is pushed back in the case to far to release.

How is it pushed back too far?

 

Everytime its chambered it pushes the bullet back in the casing a little at a time and to many times tightens the bullet in the casing causing it to be to tight to be released from the casing therefore it will ignight in the gun. THATS WHAT I HAVE BEEN HEARING. I CANT AFFORD TO CHAMBER A NEW ROUND EVERYTIME I CARRY.

 

Controlling setback is very important with Glocks.
I never used to worry about it, with any caliber, however, I actually
Had an issue with 40,.......I do not have any 40 S&W weapons any longer.

Between my G19 and G30, I normally carry the G30. At night it is on the nightstand
or in the bedroom safe. My daughter is grown, no little one so,..... less of a concern for me.

Any more these days, I do not unchamber a round except when I field strip and
clean every week

 

As I understand it, this is a more common problem with .40s&w rounds then 9mm or .45acp. I could be wrong (it did happen once :whistling: )
I keep cycling out the chambered round with my 23, but I will chamber the same round in my 19 many times over before I start to worry about it. Just my $.02

 

as i understand it, this is a more common problem with .40s&w rounds then 9mm or .45acp. I could be wrong (it did happen once :whistling: )
i keep cycling out the chambered round with my 23, but i will chamber the same round in my 19 many times over before i start to worry about it. Just my $.02

so how long is that round good for, when should you throw it away.

 

I had this problem with Remington UMC .357 Sig years ago. It wasn't properly crimped and would push the bullet up against the powered which would occasionally cause the necked portion of the case to tear off when fired and leave it stuck in the chamber. That made for an impossible to clear FTF. Never had that issue with any other ammo in any caliber. I even inspected the overall length of the carry rounds regularly for years after that and never found a problem.

 

I don't worry about it too much. It takes a good deal or rechambering to set a bullet deep enough to cause issue. I rotate the chambered rounds in my carry pistols and fire and reload every 6mos or so.

 

How many times can the same round be chambered before its no good.

 

Rotate your chambered round to the bottom of your mag every week or so.

 

How many times can the same round be chambered before its no good.

It should be fine as long as the overall length is still in spec.

 

Doesn't this happen the first time you chamber a round anyway? I wouldn't think chambering over and over would really do any harm, simply because the setback happens anyway the first time you chamber the round. So if it's already set back, what difference does it make?

 

Rotate your chambered round to the bottom of your mag every week or so.

Thats what I do and they all fire off.

 

Doesn't this happen the first time you chamber a round anyway? I wouldn't think chambering over and over would really do any harm, simply because the setback happens anyway the first time you chamber the round. So if it's already set back, what difference does it make?

its like pounding in a nail. every time you chamber it, it pushes it back a little more. I haven't ever had a problem with 9mm. That is the only caliber I own at this point.

 

Rotate your chambered round to the bottom of your mag every week or so.

+1 - that gives you several months from one magazine worth. Personally i'd wind up firing off the mag in practice a few times a year.
I don't carry a firearm so my chamber stays empty almost all the time. I'm a big believer in Murphy's law and heard and read to many stories about Glock owners accidentally shooting and/or killing themselves.
If i had to carry with a round chambered for some reason, i'd be using a trigger saf-t block - i bought one from Brownell's for $14.95 and it worked great, until i lost the @#@# thing.

 

..... read to many stories about Glock owners accidentally shooting and/or killing themselves......

That's because they are neglecting the rules of gun safety.......don't point the weapon at anything you don't intend to kill, and don't put your finger on the trigger.......its a simple concept that a lot of people cannot seem to grasp....:steamed:

 

You got to stop playing with your guns and keep them under lock and key.

My glock is loaded when its in my safe, and when its in my holster when I'm carrying. Why exactly do you need to keep on chambering and unchambering the round? My chambered round can sit there for weeks, and the only reason why it would move is when it being fire at the range, or at an intruder. I clean my guns after ever range visit, so when I'm done the gun is empty. I take the gun home, and clean it, load it up and its back in the safe. That round sits in the chamber until the next range visit.

Stop playing with your guns and you will not have to worry about setback.

 

That's because they are neglecting the rules of gun safety.......don't point the weapon at anything you don't intend to kill, and don't put your finger on the trigger.......its a simple concept that a lot of people cannot seem to grasp....:steamed:

Couldnt agree more!

 

How is it pushed back too far?

Setback can occur when a bullet hits the feedramp repeatedly. While it is possible to rechamber the same round over and over without issue, it is a good practice not to. It does not take much setback to drive chamber pressures up dramatically.

This graph from CCI/Speer shows how pressures can spike with very little setback.
http://le.atk.com/pdf/357_SIG_Setback_Length-vs-Pressure.pdf

I use a sharpie to mark the round after ejecting it. That allows me to rotate rounds through the magazine only one time.

 

Chamber it and leave it. If you have young children at home it is your responsibility to lock it up. You can leave it loaded in your safe.

 

this has been nagging on my mind too, while at work i have to have a round in the chamber. but when i'm off work not allowed to carry in the chamber.....so i always unload it and put it in lock box in the car in case i get pulled over. i've been loading the same round over again and when i compare it to a fresh one on the table i do notice a slight difference,kinda paranoid about it. btw it's a glock 23 with speer gold dot 180 gr.

 

I always leave 'em chambered (Glock 19, 26 and 30). Unchamber pretty much only to shoot. Glocks remain in kydex CCW holsters in the safe, except for the (chambered) home gun (G19).

 

If you suspect a round is suffering bullet setback, set it with the bullet up on a table next to a round that hasn't been chambered. If you can detect a difference in the height with your naked eye, you shouldn't fire that round.

Chambering a round twice is not enough to cause bullet setback.

 

I've seen significant set back on a WWB .45 ACP JHP round that I repeatedly rechambered. The bullet wasn't crimped and I don't know how many times I rechambered it. I didn't shoot the round, figured it wasn't worth the risk. If you're concerned about set back, just compare the round in question to a virgin round and see if the overall length is still the same.