CARRY A REVOLVER(sorry had to be said;) )
This is a discussion on rechambering? within the Concealed Carry Issues & Discussions forums, part of the Defensive Carry Discussions category; Originally Posted by Gunsmoke16 ...let springs rest for a while occasionally... Hm. My understanding was that it was the repeated flexing (compression and release) of ...
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CARRY A REVOLVER(sorry had to be said;) )
"Just because I'm paranoid,doesn't mean they're NOT after me...."
Protection is a responsibility not just a right.
If I'm reading it correctly, Jensens first test was WITHOUT feeding from the magazine and set back occurred. Does that mean inserting the round in the chamber and dropping the slide? If so, and the bullet wasn't getting bashed into the feed ramp, what pushed the bullet into the case?
Correct. In my first test I would lock the slide to the rear, drop a brand new round into the chamber, hit the slide release and let 'er fly. The extractor would slam into the back of the cartridge, and it mangled it up pretty good after seven times.
The second test I took another new round and loaded it into an empty magazine. This time I would lock the slide to the rear, insert the magazine with the single round, hit the slide release. This is obviously easier on the back of the cartridge and the extractor, but I measured equal results after seven times.
I don't think the feed ramp had anything to do with the setback, as the second test left the overall length .001" longer. I am guessing it is just inertia causing the setback. This was all done using a GLOCK 23, and Independence brand .40 S&W 180 grain FMJ ammunition.
Utah State Researcher,
By and large, rechambering a round is no big deal. Especially if you lock the slide back and look into the chamber with a loaded magazine inserted to see if that top round is basically a straight feed into the chamber. It is for my 1911s and Glocks. No "banging" or "slamming" of the bullet nose into anything.
I was looking at your pictures as close as I could. Do you think the setback was cause by the forcing cone rather than inertia? I was looking for land marks on the bullet tip but cannot see any. I was always told that setback was created by the feed ramp and its angle. The straighter the bullet enters the chamber, the less setback will occur. The steeper the feed ramp, the more chance of setback. Your pics and test is very interesting, maybe I should do my own similar testing. Food for thought. Thanks for posting the pics, it raises new suspicions for me.
"Government is not the solution to our problem; government IS the problem". - Ronald Reagan 1981
I have had several carry rounds experience severe setback from chambering. At the time, it was impossible to get my hands on SD ammo, so I only had the same dozen rounds to cycle. This means that after clearing the gun for a dozen trips to the range, I began re-chambering rounds afterwards.
Since this was in my ONLY handgun, and I needed to practice, my only option was repeated chamberings.
"Leaving it alone" wasn't an option; "firing after x chamberings" wasn't an option. Best bet upder similar circumstances: cycle after every chambering, check for setback.
So, Xader, did you fire those rounds? Any problems if you did?
I chamber 2-3 times. Then I fire those rounds at the range. Never had a problem, I have probably fired around 500 bullets that have been chambered up to 3 times.
When I know I will be taking the gun apart/cleaning/etc... and rechambering the same round a couple of times in a short period, I load the gun with one good reliable JHP and the rest are my premium SD ammo.
G21SF, G30, G36, Ruger SP101 DAO, S&W 642
BTY, I was looking for a site that I saw some time ago where someone compared different manufactures' .40s and found some major differences in susceptibility to set-back. Couldn't find it. If anyone has it book-marked, please post, or PM me, the url.
FWIIW, I take the chambers SD .40s and put them in a cup on the dresser.
When I'm going to the range, I micrometer the bunch at one time. (Less likely to get forgetful/lazy/etc that way.)
The ones with no set-back go back in the box and get re-chambered. Those 1.115 get shot. Never had one much shorter than 1.115. If I did, I'd trash it.
I'm just one root in a grassroots organization. No one should assume that I speak for the VCDL.
I am neither an attorney-at-law nor I do play one on television or on the internet. No one should assumes my opinion is legal advice.
Veni, Vidi, Velcro