Cycling round too often making it short

[SouthernBoy]

With a Glock it is simple to avoid this, actually forestall it for hundreds of re-chamberings. You can safely "ride the slide" of a Glock to feed a round into the breach of your Glock**. The extractor comes up under the case rim instead of slipping over it when the slide runs home. Add to this the fact that the Glock magazines are positioned to have nearly a dead on straight path into the breach and you can save rounds from experiencing bullet setback.

I have done this countless times with my primary carry gen3 G23 and have yet to have bullet setback occur. Each time I carefully check the round I am chambering to make certain there is no setback before I chamber it.


** Note. Some pistols do not work well with this and I know of one brand that specifically describes how you must chamber a round in their guns. Glocks do this with ease.... many do not.

 

[herrwalther]

Best way to avoid bullet setback (other than not owning firearms) is to avoid rechambering a round whenever possible. I know that cannot be avoided sometimes such as when you decide to brush the pocket lint off your carry weapon. If you suspect you +1 round has bullet setback, don't trust your eyes. Pull out a round or two from the magazine and compare them. If you notice a difference, break out the calipers.

I have noticed .45ACP rounds are more common to suffer bullet setback, as none of my 9 or .40s ever have. It also depends on brand. All the .45 rounds that I had to dispose of because of bad setback were usually cheap Blazer or Winchester target FMJ rounds.

 

[230RN]

JBrady555 :

I'd say that my bullet in question was probably cycled 15 times to get .020" setback.

That agrees with my own measurements of approximately 0.002" setback per chambering in my Kahr CW-9, the manual for which specifically says not to ride the slide down.

Terry, 230RN

 

[Ringer]

For dry fire practice how about after every 3 or so unload or partially unload the mag and move it down towards the bottom. Of course that would require you to keep track how far to move the next one.

For live fire I would just fire the first round. This way you are also function testing your gun as it would come out for duty.

 

[Captains1911]

Why unload the gun so often?

I love relevant posts....

 

[Captains1911]

I put a mark on the case of defensive rounds with a sharpie before I chamber them to keep track of how many times they have been chambered. Once a round has been chambered 4 times, I take it out of circulation.

 

[Dean1818]

Step one - Rotate the to bullet in the mag

Step two - Rotate the Carry bullets once per year

I keep an eye on my 40 cal more than the 45 for bullet setback

 

[jerkface11]

I love relevant posts....

Avoiding the problem is no longer a solution!!

 

[Captains1911]

Avoiding the problem is no longer a solution!!

So in your opinion the OP shouldn't ever practice drawing, dry-firing, cleaning, SHOOTING, etc? Or should he just not unload his gun first to do these things?

Like I said, completely irrelevant.

 

[jerkface11]

So it makes more sense to continue creating a problem instead of preventing it?

 

[Captains1911]

So it makes more sense to continue creating a problem instead of preventing it?

Guns need to be unloaded for all sorts of legitimate reasons, why are you having so much trouble understanding that? It's like suggesting to never drive a car in an effort to preserve the tires.

 

[NavyLCDR]

^ Post office.

Terry

It is just as illegal to possess or store an unloaded gun on post office property as it is to possess or store a loaded gun on post office property. So, why unload it at the post office?

Guns need to be unloaded for all sorts of legitimate reasons, why are you having so much trouble understanding that? It's like suggesting to never drive a car in an effort to preserve the tires.

Actually, wouldn't it be more like suggesting to never park the car to avoid flat spots on the tires?

 

[230RN]

Eyesac:

Out of curiosity, what do you think is happening mechanically that would cause unreliable extraction with the riding of the slide?

The nose of the extractor might not be contoured enough, and the springing action which presses the hook into the extraction groove may be too strong to ride over the "rim" unless the action is closed forcefully by the recoil spring.

Besides my CW-9, which didn't return completely to battery because of this the one time I rode the slide down, I happen to know that this occurs in single-loading the Mosin-Nagant 93. Very difficult to close the bolt in single-loading. I mean hammering on it with a 2x4 to close it, almost. After doing some research on it, I found that there is a published fix for this which involves polishing off 0.0XX inches from the beveled edge of the extractor.

So it does happen.


NavyLCDR:

It is just as illegal to possess or store an unloaded gun on post office property as it is to possess or store a loaded gun on post office property. So, why unload it at the post office?

A Federal Court has recently ruled that it is legal to bring a firearm onto Post Office Property ---meaning the parking lot, but it must be stored in the car and not brought into the building. The "unloading" part in doing this storage is a local requirement of Denver, which is where my PO is. I brushed upon that in my post when I said "pursuant to local law."

I used to have to park across the street, properly store my gun(s), and hobble across the street to the actual PO to get my mail in my POB "in rain, sleet, snow, and hail."

I can now pull into the parking lot, park my car in the handicapped spot, store my gun(s) legally in the car according to local law, and go get my mail, which is only a 30 foot [STRIKE]walk[/STRIKE] hobble under a covered part of the building.

Terry, 230RN

REF:
http://www.denverpost.com/breakingnews/ci_23634504/federal-judge-post-office-violated-mans-rights-by

 

[jerkface11]

Actually, wouldn't it be more like suggesting to never park the car to avoid flat spots on the tires?

No more so than the other suggestions are akin to rotating the tires every time you drive it.

 

[R.W.Dale]

Bullet setback is a real concern that anyone who depends on a semiautomatic should not only be aware of but has a means to measure (owning calipers)

I always shot my autoloaders enough that for that reason alone bullet setback was beginning to cause carry ammo stockpile problems and cost increases. Unlike the guy on the geico commercials or LEO officers with the .gov footing the bill I'm not made of enough money to practice with my carry ammo exclusively.

My solution to bullet setback issues came in the form of a ruger LCR revolver.

 

[gamestalker]

.023' set back in 9mm is substantial and could definitely cause serious pressures to arise. In my Speer #10 I read where they they reduced the oal by .030" on a cartridge that was tested to produce a safe normal 28,000 cup. Pressures more than doubled to 62,000 cup as a result.

In general, it isn't a good practice to continuously cycle the same round more than once in AL handguns. Even with normal neck tension, constant cycling will pound the bullet deeper into the case.

I would not shoot any that have been reduced more than a few thousandths. .005" wouldn't bother me, but more than that and you'll likely start to notice some pressure issues, or worse. And considering you are specifically referring to +p loads, I would avoid shooting those even more so.

GS

 

[NavyLCDR]

A Federal Court has recently ruled that it is legal to bring a firearm onto Post Office Property ---meaning the parking lot, but it must be stored in the car and not brought into the building. The "unloading" part in doing this storage is a local requirement of Denver, which is where my PO is. I brushed upon that in my post when I said "pursuant to local law."

I used to have to park across the street, properly store my gun(s), and hobble across the street to the actual PO to get my mail in my POB "in rain, sleet, snow, and hail."

I can now pull into the parking lot, park my car in the handicapped spot, store my gun(s) legally in the car according to local law, and go get my mail, which is only a 30 foot [STRIKE]walk[/STRIKE] hobble under a covered part of the building.

Terry, 230RN

REF:
http://www.denverpost.com/breakingnews/ci_23634504/federal-judge-post-office-violated-mans-rights-by

WRONG! Before someone gets busted due to your misinformation. You never read the actual ruling, did you?

http://smartgunlaws.org/wp-content/uploads/2013/07/Bonidy-Docket-Version.pdf

From the actual court ruling:

ORDERED, that the Defendants take such action as is necessary to permit Tab Bonidy to use the public parking lot adjacent to the Avon Post Office Building with a firearm authorized by his Concealed Carry Permit secured in his car in a reasonably prescribed manner,

unless you happen to be Mr. Tab Bonidy and are parking at the Avon Post Office Building, the court ruling is completely not applicable to you or anyone else, nor to any other post office. In addition:

FURTHER ORDERED, that the other claims of unconstitutionality of 39 C.F.R. §232.1(l) made by Plaintiffs are denied.

Nowhere in the ruling does it state that the post office must allow anyone other than Tab Bonidy to store a firearm on post office property and then they must allow Mr. Tab Bonidy to store his firearm ONLY at the Avon Post Office parking lot.

 

[115grfmj]

It actually happened to me in my blow back 9x18, on a round I had chambered a few times before. It had set back, but at the time I didn't think much of it, and took that mag to the range with me. Since that was the first round in the chamber it went first. Pulled the trigger and noticed a much louder report, than the usual. Also felt my face stinging. The shorter round created an over pressure and burst the case. I found pieces of the case a few feet away, and the bullet was lodge halfway down the bore. Fortunately I didn't pull the trigger again since it had chambered another round. I count my self pretty lucky considering I had brass and unburnt powder in my glasses. No damage to the pistol either, probably do to typical combloc overbuilding. The other mag I was going to use also had the first round set back.....I dumped that round.

Check your rounds before you pull the trigger!

 

[mr.trooper]

"Bullet Setback"

 

[230RN]

gamestalker noted:

.023' set back in 9mm is substantial and could definitely cause serious pressures to arise. In my Speer #10 I read where they they reduced the oal by .030" on a cartridge that was tested to produce a safe normal 28,000 cup. Pressures more than doubled to 62,000 cup as a result.

Yeah, that's why I made my arbitray setback limit 0.010" in my measurements of setback. Figured that amount would probably still be within the normal limits of both commercial production and reloading practice.

Yesterday I fired that that top cartridge on which I had been following the setback by caliper measurements at 0.008" with no noticeably different effects. Wanted to check the primer, but that case got lost among all the other cases on the floor.

Drat.

Obviously, I can't recommend that 0.010" limit as a graven-in-stone practice, but it seemed to be a safe(ish) limit to me. "YMMV."

Terry,230RN

 

[JBrady555]

Lots of good info here, thanks

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