Larry Vicker's Video with the Wilson Combat cutaway 1911
WILD!
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What struck me most about that video was the CHAOTIC motion of the cartridge during the feeding/chambering process ... not the most desirable behavior for ANY machine. I suspect it is mostly due to the fact that when the rear of the cartridge starts to slide under the extractor, the cartridge is slanted upward ... the back of the case is nowhere near parallel with the firewall.
Yes Mike the cartridge is in a free travel, as it wiggles forward from the magazine lips, the nose usually will ride the feed ramp as it is being pushed by the slide and the tipping angle places it into the chamber hopefully under the barrel hood as the case head slides up the breech face and under the extractor at the closing and lockup of the slide going fully forward...
Lots of things happening in the open space till it closes.
A lot of info can be gained from the 38Super net page with respect to Cartridge Overall Length here is the link to that page.
http://38super.net/Pages/Overall%20Length.html (http://38super.net/Pages/Overall%20Length.html)
I found this to be a very crucial part for the 10mm guns as stated in that article linked above.
QuoteFeed Timing
Overall length and bullet nose shape interact to regulate feed timing. Feed timing refers to the position of the slide as it moves forward to chamber a round. Proper timing requires the cartridge to be at a particular stage of the feeding process relative to slide position. If it isn't, malfunctions can occur. There is a range of overall lengths over which a given bullet will meet this timing requirement, and sensitivity to this can vary with gun design.
Feeding cartridges change angle twice. First when the bullet nose hits the feed ramp and they angle upward, and second when the bullet nose hits the roof of the chamber, the tip-over point, and the cartridge angles downward to straighten out and enter the chamber. During this latter stage the rear of the cartridge slides up the breech face and the rim slides under the extractor hook.
While most semi autos work similarly some can have slight differences by cartridge/caliber and bullet designs being used at various developed impulses.
Thanks for that link. I had read something like it before, and had read (and confirmed myself) that there was a gap between the top two bullets (when the mag is full, or nearly full), but not between the lower bullets ... except in the other article, it also showed a gap between the bottom bullet and the one above it. The author said that double-stack mags don't have either of those effects. Very strange and unintuitive behavior. The more I learn about the 1911 (and in particular, 10mm 1911's), the more I like my Model 69 .44mag 5-shot revolver! But I suspect I wouldn't feel that way if I liked and wanted to shoot as fast and with as many shots as most people do these days.
Quote from: Mike_Fontenot on July 04 2016 09:01:50 PM MDT
But I suspect I wouldn't feel that way if I liked and wanted to shoot as fast and with as many shots as most people do these days.
This. I am amazed when I go to the range and see guys doing mag dumps at 5 yards and only getting 1 hole in a torso silhouette.
Agreed, but I bet a lot of things wobble and jerk when seen in slow motion. Maybe in realtime it looks OK??