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In another thread about rechambering at night, I note that it may be a bad idea to rechamber a round repeatedly.

Can someone explain why?

With the price of SD ammo, I rechamber all the time.
 

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It can lead to bullet seating, or pushing the bullet deeper into the case. This can lead to higher pressures I hear, and damage or worse.
 

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Urgh! So, how many times is it safe to rechamber?
That's a good question.......unless you have a set of calipers and keep records. The overpressure issue is more pronounced in the 40S&W. We are talking factory PD ammo here in general.
 

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Set-back is rarely a problem for me since the only time I remove my carry ammo is when I practice at the range, but I do check the carry ammo with a caliper periodically.
Since I shoot my handguns in rotation it's only once every 5th trip to the range that I need to worry about set-back. Just one more reason I like my revolvers:yup:
 

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Set-back is rarely a problem for me since the only time I remove my carry ammo is when I practice at the range,
Same here. When I empty the magazine to shoot the range ammo (about once a week), I mix up the carry rounds so there's only a 1-in-13 chance of putting the same round back in the chamber. When I practice with my carry ammo, I shoot the "in use" magazine first, so the ammo gets changed out, usually about once a month.
 

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:haha: Good advice by all..... I got nutin.
 

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Don't be cheap. Setback can ruin an expensive (inexpensive too) firearm, shooting hand, eyeballs, and a life. Who wants a tombstone that says, "he was good at saving a buck"?
 

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If you're really concerned about bullet setback another thing you could do is just chamber with a range round (FMJ) and have the SD rounds in the mag(s). Just chamber the FMJ round once and if you eject it, use it at the next range session and load a fresh FMJ.

Ever since I've heard about bullet setback, I've been logging the length of the round chambered for each of my pistols and have yet to see any setback. I have at least three re-chambering per and nothing so far. Since I had the caliper out, I actually ordered my rounds in the mags from longest to shortest with the absolute longest being the one chambered.

The results were with either 9mm +P 124gr Gold Dots or .45 ACP +P 185gr Corbon DPX. The pistols were either CZ (9mm) or XD .45ACP.
 

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If you know what you are doing, you can manually chamber a round then put a full magazine in. This cuts down on bullet setback.
 

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Don't be cheap. Setback can ruin an expensive (inexpensive too) firearm, shooting hand, eyeballs, and a life. Who wants a tombstone that says, "he was good at saving a buck"?
+1 well said.
 

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I'm a new CHL'r
after seeing this thread i checked my ammo
I been carrying my G27 for a month and a half.
some nights I unload it . and some i just put in the night stand.
so i would guess i have done this a few nights each week,
I decided to ck my Bullets..
this bullet was pretty beat up but to measure it . it was 1.122".
I cked the next bullet and it was 1.124" I thought wow.
so I cked all ammo in the Mag. some were 1.122" to 1.1245
so some that have never been chambered were as short as the one that was chambered off and on for a month or more.
but that bullet was beat up.
so I think it's a good idea to rotate ammo.
but as for impacting the lead.
I would say it happens but how much for how long, would be hard for me to say .
Fresh ammo for SD.
These were Federal, Expandable Jacketed .40s

Great info on this site....thanks
 

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If you're really concerned about bullet setback another thing you could do is just chamber with a range round (FMJ) and have the SD rounds in the mag(s). Just chamber the FMJ round once and if you eject it, use it at the next range session and load a fresh FMJ.
Yeah...

The round in the chamber may be the only one you get off in the event you really need it. Guns fail to cycle due to the slide being grabbed, it being pressed into someone, clothing being in the way, limp wristing...ectra.

You want to bet your life on a $1.25 per bullet DPX round...or a $.22 Federal American Eagle round?

If you are so conserned, when you rechamber, go with a round lower in the mag.
 

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In the last seven months of watching rounds be rechambered and extracted daily I have found the following:

Of 364 rounds that were chambered and extracted daily for over a year (only about 20 of which were actually rotating through the chamber), I personally removed from service about 5 slightly setback rounds (noticeable to me, but minor) and about 5 catastrophically setback rounds (would have definitely destroyed the weapon if fired). These were likely due to individuals repeatedly rechambering already setback rounds.

Since the last ammo replacement, I have observed the same circumstances with rounds in service for about four months, and I have seen no setback of rounds, yet. (Note: old rounds were 9mm +P+ Hi-shocks, new ones are 9mm +P+ Hydra-shocks; IMHO I have reasons for disliking both, EDIT: Note that the weapons in question are a mixture of Gen 2 and Gen 3 Glock 17s)

Essentially, old rounds were chambered and extracted about 200 times each, without any inspection before I got to them, and they did eventually setback, some worse than others. All had substantial case wear (scratches and gouges), but extracted just fine. New rounds have been chambered and extracted about 40 times each with nothing but light case wear.

On a personal weapon, I had Gold Dot 9mm +P 124grs that were chambered and extracted repeatedly over about 2 years (I was young, stupid, and poor), of about 60 total and 10 cycling rounds, I saw one VERY minor setback. This didn't occur until after I took the weapon out of EDC.

In my experience, rounds can be recycled through the chamber repeatedly and still function safely. However, even the best will eventually setback, and you MUST inspect the rounds regularly. Ideally, all rounds available should be rotated through the chamber to minimize wear and the possibility of problems, and again REGULARLY INSPECT them.

Sorry for the long post, hopefully this is useful!
 

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Yeah...

The round in the chamber may be the only one you get off in the event you really need it. Guns fail to cycle due to the slide being grabbed, it being pressed into someone, clothing being in the way, limp wristing...ectra.

You want to bet your life on a $1.25 per bullet DPX round...or a $.22 Federal American Eagle round?

If you are so conserned, when you rechamber, go with a round lower in the mag.

So, shot placement isn't what matters, it's the round you've used?.? Yeah . . .
 

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So, shot placement isn't what matters, it's the round you've used?.? Yeah . . .
Ya know, it's a combination of factors.

I hear the placement comment all the time, but placement with a round that's not going to do the job isn't all that effective, is it?

You may not get the shot you want. You may get a perepheral shot, an obstructed shot, have to shoot through cover or in a crowded area hoping your round doesn't blow through someone...

If you could place every shot perfect, then why not 124 grain FMJ NATO ball ammo?

Real life isn't perfect.

Neither is real life shot placement.
 

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My method seems to work well. If you do unchamber a round, mark it with an sharpie. Then empty your magazine and place the marked round at the bottom. Then load the mag up and chamber the one off the top. Repeat this process every time you rechamber being sure the round you just ejected is at the bottom. When you chamber a round 2x you should mark it again and repeat the above process. Once you cycle through to the rounds with 2 marks, fire them at the range during your practice session. If you unchamber your EDC 1 time a month to clean it this will take approx 20 months to cycle through an entire mag, assuming it's the only time you ever unchamber besides range time (this assumes 10 rounds in a magazine as baseline).

Now, 20 months for 10+1 rounds is inexpensive. You get 50 rounds of SD ammo online for what? $25-$30? That is less than $6 every year and a half, about a penny a day if my math is correct. If you stock up on SD ammo which I think is good anyway (4+ boxes at a time) then you'll have years worth of SD ammo if you don't regularly shoot it and buy a box or 2 here or there to keep supplied. This is all assuming you don't have a defense situation come up where you have to fire. We all know it's possible but nobody looks forward to it.
 

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Ya know, it's a combination of factors.

I hear the placement comment all the time, but placement with a round that's not going to do the job isn't all that effective, is it?

You may not get the shot you want. You may get a perepheral shot, an obstructed shot, have to shoot through cover or in a crowded area hoping your round doesn't blow through someone...

If you could place every shot perfect, then why not 124 grain FMJ NATO ball ammo?

Real life isn't perfect.

Neither is real life shot placement.
That's exactly my point within your original single shot scenario. It's the trajectory, depth of penetration, organs struck, the perps psychology and physical state, etc. that matters in ending the aggression and not just some magic bullet. My point is that the bullet alone does not determine the outcome. I know you know this.

Realize that I'm not arguing about the additional benefits of a hollow point such as reducing the possibility of over-penetration and/or additional damage caused by the expanded bullet. My first post in this thread specified how my first round is a Gold Dot or DPX. I don't believe in magic bullets, though.
 

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If you know what you are doing, you can manually chamber a round then put a full magazine in. This cuts down on bullet setback.
This is a method I used on my old P99, with the external extractor. However, I have heard several reports of CZ and Glock (maybe others) extractors breaking due to manual loading. It does work, but be careful about it.
 

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I'm no expert in this but there was another thread running somewhere on this a few months ago.

I was re-chambering and checked a couple rounds that had been through at least 5 or 6 times and couldn't measure any setback (measured with dial calipers). These were Win. RA9-T. Another guy on the thread measured his and had zero setback. A guy with a webpage measured his and got huge setback in 4 or 5 re-chamberings. A guy at the local gun-shop had noticeable setback on his 357 sig with just a few.

It looked like the biggest factor was bullet design. Some bullets have a bulge where the case ends (like the RA9-T) that prevents setback. Others do not.

I've minimized un-loading and am cycling previously chambered rounds to another magazine but I think at least with the ammo I'm using, it's not an issue. If you have calipers, cycle a round several times and see what happens for yourself.
 
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