I know from personal experience this happens with regularity in pistols.
But I’ve never really tested it in rifles. Is this a “thing” with rifle ammunition?

what do you mean by setback?

If you keep chambering and rechambering a single loaded cartridge in any semiauto firearm that doesn't have the bullet tightly crimped, you're going to eventually have setback.

It's caused by the bullet hitting the feed ramp at speed over and over.

If you're doing a chamber it once and fire it, you won't get setback unless the neck tension is not sufficiently tight, regardless of how the neck tension is done.

quote:

Originally posted by Flash-LB:
If you keep chambering and rechambering a single loaded cartridge in any semiauto firearm that doesn't have the bullet tightly crimped, you're going to eventually have setback.

It's caused by the bullet hitting the feed ramp at speed over and over.

If you're doing a chamber it once and fire it, you won't get setback unless the neck tension is not sufficiently tight, regardless of how the neck tension is done.

I shot Service Rifle and Garand Matches for years,
handloaded just about every round I shot and never crimped 5.56/223 or 30.06.

no set back issues,

quote:

Originally posted by lyman:
what do you mean by setback?

Repeated chambering of a single round, causing eventual deeper seating of the bullet into the case.

Personally, have only seen it once on a 357Sig.

quote:

Originally posted by P250UA5:

quote:

Originally posted by lyman:
what do you mean by setback?

Repeated chambering of a single round, causing eventual deeper seating of the bullet into the case.

Personally, have only seen it once on a 357Sig.

I didn't address that directly, but will now. I used to shoot at a range that a certain local LEO shot at with his son a couple of times a year. He'd come in while I was there and give me a handful of rounds that had setback from his carry gun.

Seems he'd get up in the morning, shower, get ready for work, then he'd load his handgun.

When he came home from work, he'd go to the bedroom and unload it. If he and the wife decided to go out, he'd load it up again.

He ended up with setback on 9MM Gold Dots and he'd give them to me to disassemble and use the components.

I disassembled them right there on the range after he left every time.

Normally people know it's happening because the gun jams (or blows up). So really, barring malfunction, how would most people ever know if they were?

I checked my edc ammo yesterday and found one 9mm Speer gold dot to be 1.10 vs the factory spec of 1.20”....took it out to the garage and put it in the pile to be disassembled next time I reload or tinker.

I only clear the gun when I go to the VA and I handcuff the g19 to my trucks seat..so that round has been rechambered several times.

When I was a cop and had to chamber a round in my AR, I always put that round aside when I was done and had cleared the carbine. Those rounds got shot at the next training class. But I sent out an email quarterly to the other cops not on my shift to check their ammo for setback. You could turn in a round of pistol ammo or rifle ammo to the duty sgt and get a replacement.

It was an unofficial policy after I showed a setback 5.56 round to the Chief one day and asked him if he wanted an officer hurt when a gun burst.

Most times a crimped round won’t display setback unless it’s been rechambered several times. Just better to head it off at the pass and my policy is with an AR if it’s been chambered and not shot it gets shot next time I’m at the range.

I check my pistol ammo probably once a year because I don’t download my pistol much.

I unload and lock up my carry pistols each time with small children in the house, I don’t dare leave anything loaded.

This was happening to me quite a bit but now I load my first round with a sacrificial FMJ rather than an expensive JHP so if and when it happens again, I can just set that round aside for the range dud bucket and use another FMJ.

I wasn’t aware this could happen with rifle ammo but if you’re continuously chambering and emptying it each day I could see it.

I have only experiened setback in a rifle round when it doesn't feed smoothly and the round gets driven into part of the breech face. What has proven to be a bigger issue is truly accidental discharges from the constant rechambering of ammunition in a firearm with a floating firing pin.