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05-23-2010, 06:20 PM
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Join Date: Dec 2008
Location: Springfield, MA
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Crimp Jump in My M&P340
I picked up some 158g 38spcl reloads from a friends friend a little while back. I put 50 rounds through my SP101 w/ no issues, but today I put 5 rounds down range w/ 0 issues, then I gave 5 more a try. After the 3rd round the cylinder jammed up. I got the cylinder opened and noticed the bullet was almost out of the case... I thought this was more common with the lighter 357 rounds? Or is this happening due to poor reloading? Im thinking that could have turned ugly...?
Whatcha think?
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05-23-2010, 07:15 PM
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Join Date: May 2009
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Might well be a light crimp on the reloads. However, very light revolvers have a real issue with bullet jump, even with some factory ammunition. The last Smith owners manual I looked at reccommended testing their light weight revolvers for jump before carrying. Good advise.
It seems to me that a 15 oz or so revolver weight is the point where bullet jump becomes a real issue. Lead bullets seem to be a bit more prone to movement than jacketed bullets, but they will all move unless tightly crimped.
If you reload, just make that your expander is not oversized (this is a big deal) and use a heavy roll crimp on lead bullets that have a crimping groove. For anything else, I use a match grade taper crimp.
All this applies to the 357 as well as the Special.
FWIW,
Charles
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05-23-2010, 09:05 PM
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I could be wrong, but I would expect a good stout FBI load to jump crimp in a scandium snub such as a 340 PD, even if crimped heavily. A jacketed .38+P or .357 such as the Speer SB offerings is the way to go, IMO.
When I briefly danced with masochism by trying to use Remington .357 125 gr. SJHPs in my 360PD, I found that the last round in the cylinder would have jumped crimp a little.
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05-24-2010, 07:05 PM
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Join Date: Dec 2008
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Texas1941 thank you for the information... I passed it on to the fellow who did the reloading.
I do normally carry it with the Speer GDHP SB 135 38+p, but only shot one cylinder. I was using these as practice ammo.
Just an expensive revolver to just pass on......
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