Chambering same round more than once - Page 3
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Old 02-20-2012, 04:29 PM   #21
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One more reason to carry the revolver.

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Old 02-20-2012, 06:42 PM   #22
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Quote:
Originally Posted by BigByrd47119 View Post
Doesn't the CD line of ammo sport some "new technology" that prevents set-back? I would have sworn I read that somewhere, maybe even on the box or manufacturers website...

Sorry if this has been posted already, kinda in a hurry.

Hope this helps!
BigByrd,

Thanks for the comment. I went to the Hornady website and found the following among the claims for their CD ammo:

"Bullets are cannelured and crimped to avoid bullet setback."

Many of the opinions in this thread seem to be along the lines of "a few times may be tolerable, but a lot of repetitions could be a safety (overpressure) problem." Several of those opinions are from folks whose opinions I respect based on other posts by them. Claims by the folks selling the rounds must be viewed as sales talk (i.e. possibly less than entirely correct) but may be at least partially valid.

I plan to dig out my micrometer and see just what happens after 1, 2, 3, ... many ... rechamberings of a single round. I'll post the results some time this week (I hope).
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Old 02-21-2012, 10:41 AM   #23
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Cars sold in the US are the safest to date. But the driver still has a responsibility to do his/her part.

Ammo makers do things to avoid bullet setback, but the ammo is designed to be shot, not chambered, rechambered, rechambered, and rechambered.

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Old 02-21-2012, 01:18 PM   #24
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Quote:
Originally Posted by primer1 View Post
One more reason to carry the revolver.
Dont worry revolvers have similar issues due to recoil during firing. It can happen with factory and especially with improperly loaded ammo

No gun design is perfect save for the super soaker they all have positives and negatives. Just choose the type of negative your willing to deal with. The key is regardless what gun you have using quality ammunition in the correct manner is the key to keeping all your digits
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Old 02-21-2012, 01:29 PM   #25
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Quote:
Originally Posted by trip286 View Post
Just fire off the chambered round. If your going to the range that much, it's obvious you can afford ammo.
Now the logic of that is indeed funny! LOL
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Old 02-21-2012, 03:42 PM   #26
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Has anyone here ever had a round ftf from being chambered to many time?Seems like people are reading into this a little to much.

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Old 02-21-2012, 04:04 PM   #27
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Quote:
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Has anyone here ever had a round ftf from being chambered to many time?Seems like people are reading into this a little to much.
The concern is not FTF, but over pressure.
Most SD rounds are already pushing the SAAMI standards. Setback creates more pressure. I've never had a gun blow up due to pressure, but I sure wouldn't want to chance it by rechambering the same rounds.

The .45ACP bullet is held in place by the casing. The ogvie of the bullet being pushed by the lands can and has created setback.
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Old 02-21-2012, 04:14 PM   #28
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I understand what could happen but this is highly unlikely to happen.ammo in the box is loaded shipped and stored and dropped and who knows what in shipping all sitting on the bullet.I'm not sayin it couldn't happen.I also reload 90% of my ammo I'm well aware of what could happen.Not tryin to argue

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Old 02-21-2012, 04:44 PM   #29
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Default Use a second magazine

leave the self defense ammo in the first magazine

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Old 02-22-2012, 04:45 AM   #30
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Quote:
Originally Posted by slim325 View Post
I understand what could happen but this is highly unlikely to happen.ammo in the box is loaded shipped and stored and dropped and who knows what in shipping all sitting on the bullet.I'm not sayin it couldn't happen.I also reload 90% of my ammo I'm well aware of what could happen.Not tryin to argue
Ammo in the box is loaded, shipped, stored and dropped, all at much less than the accelerations that occur during chambering of a round by a semi-auto. It is possible (maybe even likely) that the precautions taken by the ammo manufacturer will reduce the chances of setback a lot. But, those precautions may only be sufficient to resist 2 or 3 impacts on the feed ramp before giving ground to the setback. They surely have to tolerate one chambering or their ammo would not be reliable for the first shot. They probably tolerate a few. The question is how many is a "few". Is it 2 or 3? 5 or 10? 50 or 100? Planning a strategy to deal with the setback issue requires that we know the answer.

I have found my micrometer and it appears to be working. My intention is to take one of my SD rounds and cycle it many times, measuring after each cycle. I will try to take photos of any significant changes to the plastic plug, for example, during the process. Tonight was spent recovering from some low back muscle spasms. Didn't think muscle relaxants and pain killers were a good prep for careful measurements. Will report results when I do the experiment.
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