Fact or Fiction: “Bullet setback from chambering the same round of ammo too many times is dangerous”

IMPORTANT: This test is just an example using one round of one brand/type of ammo in one pistol. So, it is NOT conclusive. We recommend you run your own tests using your pistol and ammo combo to know how it will do.
Today we are going to test a common internet notion that chambering [aka loading or cycling] the same round of ammunition in your pistol/handgun/rifle too many times can be dangerous. The notion goes to claim that the force of loading the round can cause the bullet to go deeper into the case as it slams against the feed ramp, which would reduce the cartridge Over-All Length [OAL]. This reduced OAL would increase chamber pressure. Lets find out if it’s actually true that rechambering the same round will reduce OAL by running some tests.
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[@jamesdelong6401]

OOPS! Sorry, i forgot to say how many times on chambering and what my ammo i use for my EDC. It took 60 times of chambering the same round for me and the ammo i use for my EDC is. Federal syntech defense SJHP 138 grain for both my 9mm and 45acp

[@anangryranger]

Try this with other firearms. I do not own any plastic pistols. I do however, own two 1911A1s. And round setback is a genuine issue. After four to five slide drop loading of both factory and reloaded 230 ball rounds, setback is significant. From my own experience, it's no myth.

[@adigaarmory]

Indeed... we actually put a warning about that in the description... me testing with one gun/ammo combo is definitely not conclusive. I bet it's because the Glock has such a loose chamber and less steep feedramp compared to the 1911.

[@anangryranger]

@@adigaarmory Yes sir, I've had, note: HAD, a few plastic pistols over the years, but they're gone. For me, its strictly 1911A1 in 45 Auto all the way. The only autoloader pistols among my many revolvers. And yes, the 1911 was designed to be reliable and efficient with ball ammo. Yet, even then, the bullet setback is a genuine concern if the same round is loaded multiple times. And as a retired gunsmith and police armourer of many years, both my personal 1911's are ported, polished, and tuned to perform. They'll both hand cycle a full magazine of empty cases flawlessly, but there's no denying some setback will occur with live ammo.😏

[@timvest8141]

You should switch to ball ammo that doesn't have the ring around the case and try it again.

[@TheAxe4Ever]

Setback is an issue for some cartridges. Not so much for the cartridge you are using here because it appears to utilize a Cannelure on the projectile and case which helps prevent setback. But some cartridges like the Speer Gold Dots don’t have a Cannelure on the casing. I noticed setback after only about 5 rechamberings with the Gold Dots. If I unload my chamber for whatever reason and rechamber the same round, I put a mark on the bottom with a sharpie. After 4 marks, it goes into my box of “to be fired” ammo for zeroing my optics or just to practice with my carry rounds. Not only do you have to look for setback from multiple rechambering, but another possibility, although not as likely is the primers can “deactivate” from the inertia of the round slamming into the chamber. Also look for damage to the rim from the extractor after a few times rechambering. I take a little time to inspect my carry rounds occasionally because I want to know they will function if god forbid I ever need it. The more I can do to prevent a malfunction, the better.

[@Dremansworld]

I get it with all my firearms, I try to cycle the mag everytime I have to unload and reload so its not the same round all the time. In my 9mmk if have had 2 to 3mm set back on some carry rounds.

[@jamesdelong6401]

It's a fact. I have noticed, tho that there is a difference when chambering the same round with using the slide release button or pulling back on the slide and releasing and chambering a round that way. From my experience using the slide release button is easier on the round than pulling back on the slide to chamber. I usually start seeing a difference in chambering the same round after a month of using the slide release button. If i rack the slide i usually see a difference in the round around two weeks of doing that. Once i see the ' bullet ' has moved into the casing further from chambering it so many times. I throw that round out. Usually i can tell from reloading that round back into my magazine. When i get home. I un-load my EDC pistol. So that all said. Yes, to be ' on the ready ' on having a round in the chamber when i leave the house. Its worth tossing a round every month that be chewed up from chambering it every time.