45ACP Casings Power Burns.
I have a Sig 1911 and the cases all show powder burns, but only on one side of the casing. Is this a problem with the size or shape of the chamber? I've never seen this with any of my other semiauto pistols or rifles.
Thank you.
Thank you.
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Nothing wrong with your chamber. Its very common. I use a lot of brass recovered from our academy classes, and see a lot of the powder burns on the outside of cases in 9mm, .40 and 45. If the cases fit tight enough to eliminate it, they would have trouble extracting. 0 -
Without having a camera in the chamber to confirm, so this is only a guess; I bet there will still be very high pressures, hot gasses and maybe even a tiny bit of burning powder in the chamber when the brass case springs back a millisecond after firing but before extracting. That combination will blow back a touch of fouling onto the outside of the case before it's pulled out and tossed free. It's normal on just about every semi-auto I've shot to find some burns on the outside of the cases.
If you want to see weird cases, H&K MP-5 and some of their rifle chambers have "flutes" in them. This leaves burns on cases that look like an official's "zebra" shirt when they're extracted.0 -
The best way to minimize this is to load with fast buring powder Bullseye ,231,ETC and make sure you size the case small enough to Grip the bullet firmly and load bullets as long as the Magazine and chamber will accept. The brass caseing has to expand to seal the brass to the chamber wall Fast powder does this quick because pressure spike is quicker . increase bullet pull will also increase pressure before bullet moves and long bullets will touch the barrel forceing cone / lead in of the chamber quicker causing increase quicker.
EDIT one side is normal because the case has not expanded but most of the case like 270 degrees is touching barrel chamber0 -
My 91 shows the flutes, but the 45ACP cases only show the powder fouling on one side of the case. Is the fouling only showing on one side of the case normal?
I am using factory Federal and Remington 230gr ball.0 -
The other cause, and of no concern at all, is the 45ACP operates at a lot lower chamber pressure than the 22LR. brass that has been loaded a few times or is thicker barely reacts to the pressure. Some gas gets by the case mouth and "smokes" the case.
http://www.lasc.us/SAAMIMaxPressure.htm
Some super-duper-go-way-fast 22 LR "Hyper-velocity" shells operate at close to 28K [:0]
The 45ACP max is 21K.0
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