This is a discussion on Reloading 357 sig. within the MP Reloading forums, part of the Smith & Wesson MP Forum category; I just loaded up some 357 sig with VihtVuori 3N37 powder and nosler 115 hps. I had one misfire due to a bad primer, (found ...
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|August 2nd, 2012, 06:40 AM||#1|
Join Date: Nov 2010
Reloading 357 sig.
I just loaded up some 357 sig with VihtVuori 3N37 powder and nosler 115 hps. I had one misfire due to a bad primer, (found the inside of the primer on the floor after reloading so I knew I had one dumby round somewhere).
When I went to eject the misfire, the bullet pulled out of the case and was jamed in the rifling. Had to go home and get a rod to knock the bullet out. It was jammed in pretty tight.
I loaded them to O.A. length of 1.131 inches. The book says the MIN. length should be no less than 1.201 inches so I was .01 inches above Min..
I have been reloading for over 65 years and I can't remember this ever happening before.
Only two ideas I have come up with is the shape of the bullet or maybe I didn't crimp enough. Any Ideas?
|August 2nd, 2012, 02:40 PM||#2|
Join Date: Oct 2007
Your initial quess, bullet contour, is probably a good quess, but a bad crimp (common on 357 Sig handloads) could easily allow the OAL to change.
|August 3rd, 2012, 02:27 PM||#3|
Join Date: Nov 2010
i made another observation. I think I will not use 3N37 powder in the m&p compact since it gave me ring of fire in front of the muzzle about 6" in diameter. I think I will be better off with #2 powder. Although the flame out the muzzle would probably give anyone pause that might be threatening!
I will try some 115gr Laser-cast bullets also.
|August 11th, 2012, 09:14 AM||#4|
Join Date: Aug 2012
I’ve Been loading .357 Sig with 12.2 grains of Accurate No 9 and 124 grain flat point plated Berry (or similar) bullet for a few years with great success. I've shoot several thounsand rounnds through my Glock 31 and Glock 32. Two keys make this work. The shape of the flat point provides an adequate area for the brass to hold on to. Another key is initial die and crimp setup. To test round to ensure case is holding bullet, press the round face down on a block of wood. If you have a good fit it will not collapse. If you have a bad fit it will collapse. The Accurate no 9 is also helpful because of its bulk it almost fills the case making it that much harder for the bullet to collapse into the case. Sorry, but the Acurate no 9 is a bit blasty and will throw a fire ball. This is a great link for anyone new to 357 Sig reloading HandGunInfo.com: 357SIG: 357 Sig Safety & Reloading FAQ
Last edited by vmainaz; August 11th, 2012 at 09:18 AM.
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