Posted: 6/8/2010 3:34:29 AM EDT
| I've read on here that some malfunctions are caused by the same round being chambered multiple times. Is there a ballpark number that is the limit for how many times that round can be chambered? |
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All depends on if the bullet is getting set back into the case from it ramming into the feedramp.
You'll need to keep an eye on overall cartridge length and if it starts to get shorter than the other rounds in the mag, either shoot it before it gets any worse, or trash it. Posted Via AR15.Com Mobile |
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Just for reference...
9mm Ranger Bonded 147 grain - over 20 chanberings with no movement in a M&P 9 and 9c. I have tried this on 3 different rounds from the same box. I am using a dial caliper to measure the two same points each time. I have not tried that with any of my other ammo or other guns yet. |
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Genuine law enforcement ammo is usually rated by the maker for 3 to 4 chambering before it should be fired in practice.
The big danger of bullet set-back isn't a KABOOM it's a second round stoppage. Early in the LE change to the automatic pistol they had a large number of second round failures to feed. The gun would fire the first round, then fail to feed the second. This was caused by bullet set-back shortening the overall length causing feed problems. This was due to daily inspection and re-chambering the same two rounds over and over. One trick is to keep a "master round" handy. That's a round that's never put in the gun at all. Use it to do a fast visual check of rounds that are being used. If one looks short, shoot it in practice. |
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Quoted: Quoted: do some testing and let us know...i think .45 does it worse then the other rounds... I nominate Wizzo for this. 9mm/45acp: HST, Ranger T, Corbon DPX please. Want to borrow my calipers? Lol, I'm pinching pennies to afford some reloading equipment right now. That, and I don't want to test out Springfield's warranty work first hand 
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I would say once... Why take a chance on something as small/cheap as this? If you can't spare the round, I'd atleast load it at the bottom of my mag to reduce/eliminate the odds of a second round stopage.
My defensive weapons are loaded at all times and when its time to unload them, I put the chambered round in the "practice box". |
| When I worked at Brinks we were issued 180 grain Gold Dots. We changed our HP's once a year. We had to unload our firearms every day and turn them into the vault. Some guys were lazy and didn't mix there chambered round, so over a year the same two rounds were chambered over and over. Those rounds had quite a bit of set back. But those of us that mixed our chambered round every day rarely had set back, but those rounds only got chambered about 10 times a year. |
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I drop the 1st round in my CCW XD 40SC directly into the barrel throat through the ejection port, then drop the slide on it. I then load a full mag. Would dropping it directly into the throat of the barrel negate the setback issue? I'll get out the calipers and measure / compare, but I'm just curious. |
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Quoted:
I drop the 1st round in my CCW XD 40SC directly into the barrel throat through the ejection port, then drop the slide on it. I then load a full mag. Would dropping it directly into the throat of the barrel negate the setback issue? I'll get out the calipers and measure / compare, but I'm just curious. Thats the same thing I do, don't want to chuck a jhp every time I give my carry gun a quick cleaning
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Quoted:
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do some testing and let us know...i think .45 does it worse then the other rounds... Actually .40S&W is far worse in my experience. The absolute worst brand of ammo for it is Remington Golden Sabers. This is 100% correct, in my experience. Visible setback is evident after as few as 3 chamberings of a Golden Saber in my G23. I WILL NOT drop the striker on a round with setback in that weapon. To do so is to tempt fate. Switching over to Gold Dots very soon. |
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Quoted:
I drop the 1st round in my CCW XD 40SC directly into the barrel throat through the ejection port, then drop the slide on it. I then load a full mag. Would dropping it directly into the throat of the barrel negate the setback issue? I'll get out the calipers and measure / compare, but I'm just curious. Some extractors do not like this method and could give you problems. Otherwise, yes, no setback issues. |