Deleted
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Post by Deleted on Jul 21, 2019 9:25:47 GMT -5
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Post by Ken O'Neill on Jul 21, 2019 11:24:26 GMT -5
Scott,
Try Standard Velocity ammo to see if there's an improvement.
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Post by bradshaw on Jul 21, 2019 11:39:01 GMT -5
I've had a 43c a few years, 750-1000 rounds thru the gun. The last 3 times I've shot the gun I have experienced case set back that near ties up cylinder rotation. It does not seem to be specific to one chamber and has happened on 2 chambers in a cylinder full. After the round is fired the case backs up around .015 and makes it near impossible to rotate the cylinder. Gun is kept clean and was perfectly clean this morning when it happened several times. Cylinders "seem" large, this is not a scientific measurement. Using new CCI Mini Mag 40's and 10 year old CCI Blazer 40's. Will happen with the gun cold or hot. Aluminum v. Pressure issue? In the photos the offending case is the last one fired under my thumb.    ***** Beyond some very good .38 Specials----my experience with aluminum J-frames is limited. Aluminum revolvers have limitations. There have been developmental challenges, especially with aluminum cylinders. To sleeve or not to sleeve. Containment of working pressure. Robustness of stop notches. Your M-43 cylinder appears to not be sleeved. With 750 to 1,000 rounds through it, there may be a bit of SPRINGING in the chambers. Possibly there is some ENDSHAKE. “... case backs up around .015” suggests excess HEADSPACE or ENDSHAKE, or a combination. I would call S&W service, describe the problem, offer to send photos. In addition, I would ask whether S&W can retrofit a steel cylinder. Interesting, firing pin @ 6 o’clock to the rim; wonder if that increases strike? David Bradshaw |
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Post by Deleted on Jul 21, 2019 11:46:22 GMT -5
Cylinder is not sleeved. Agree with all above. That being said if it requires standard velocity ammo, what’s the point.
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Post by bigbrowndog on Jul 21, 2019 12:58:00 GMT -5
Possibly related,....I am having issues with CCI 22wmr ammo in a bolt action, but I’ve never had issue with Winchester 22wmr. The case expands enough in the chamber that the extractor slips off and leaves it in the chamber, which causes me to remove the magazine and recycle the bolt. So it’s possible that CCI is using softer or thinner brass???
As for standard velocity ammo, I’d be curious what velocity you’re getting with HV ammo from the short barrel you might be surprised!!!
Trapr
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jd
.30 Stingray
Posts: 204
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Post by jd on Jul 22, 2019 15:05:06 GMT -5
One thing to look at is the firing pin. I have a 617 with the same chisel point firing pin, and have had the same problem which I attributed to case set back. I spent years trying to solve the case set back problem that I thought I had. Turns out that the problem was with the firing pin. After a lot of rounds through the gun, the tip of the chisel point firing pin had enlarged just a hair, but enough where the firing pin spring was not always able to retract the firing pin from the indentation in the 22 case head. With the firing pin stuck in the case head, the cylinder wouldn't turn until the cylinder was jiggled just enough to get the firing pin to let go. By VERY careful stoning of the firing pin sides to restore the taper to the tip, the problem went away. S&W has since dropped the chisel point firing pin design and moved to a round tip....
The case heads in your photos don't show any drag marks from being set back and then turning the cylinder... My bet is that your firing pin has the same problem that mine did..
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