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357 sig not going into battery with reloads


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i have been loading 357 sig for several years but not volume.  i just made too many new rounds and now every round i have to push the barrel forward to go into battery.  no setting have been changed.  would like suggestions.  gun is sig 2340

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Different bullet or bullet profile? New or used brass? Even bullets from same manf can have ogive differences from lot to lot. If your seating long it could be the problem. Or your guns dirty. 

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.357 SIG cartridge is a PITA to reload when you first start, fun to finally get 100% success on reloads.  

Do you have a cartridge gauge?  I had this problem several years ago and re-sized the loaded cartridge, its not ideal.  Going forward, I would suggest a .40 cal de-bulging die, run the cases through that before sizing the the case during reloading.  I also use a redding tapper crimp die for the last step.  

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Pretty much agree with Banacek on this one.  I use a cartridge gauge (Wilson) to set my cases to factory spec, headspacing off the shoulder.  Debulge as necessary, of course.  I use Lee FCD, and not too much of that, just enough to make sure bullet won't set back.  My .357 SIG's are Glocks so I assume the chamber is fairly loose but I don't have problems with reloads.  Unless shooting bullseye, I think "tight" chambers are more of a liability than an asset for action shooting.

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ordered guage, post office claimed it got my mail box,  never saw it.   i will try oal  to see if that has any effect. i do resize with a 40 die 1st.  no bulge issues . they will fit into a 40 barrel

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What brand resizing die are you using? When I started reloading 357SIG (resized 40S&W) I used an RCBS which did not set the shoulder low enough and would cause slide not to go into battery. Ended up machining some of the base of the die off (can’t remember how much) to get the shoulder of the case right. I’ve since switched to Dillon resizing die and haven’t had any issues. Alternatively your resizing die might have backed out just enough or it’s not touching the shell plate. 
 

I had issues with old Winchester cases given to me by a fellow shooter that had been used in a Glock. Had a lot of bulged cases and had to throw them out. After that I got a rollsizer and put everything through that before resizing. 
 

Last thing I never bothered with a case gauge, always used the barrel to check rounds (don’t bother since rollsizing and have about 10k through mine and a couple of friends guns without issue). 

Edited by SuperDuke
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Had that problem (finally) last year.  Some of the cases I was loading were slightly longer than others.  I'd set the (very small) amount of crimp up to remove the flare on the case mouth on a shorter case, I suppose.  When a longer case went through the crimp die I'd get a small bulge very near the case mouth (vs. down at the top of the shoulder like a rifle case when over crimped).

 

I hate the thought of having to trim a darn pistol case.

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Plunk Testing:
The solution to chambering problems is to determine the cause:
Take the barrel out of the gun. Drop rounds in until you find one 
that won't chamber. Take that round and "paint" the bullet and 
case black with Magic Marker or other marker. Drop round in 
barrel (or gage) and rotate it back-and-forth a few times.
Remove and inspect the round:
1) Scratches in the ink on bullet--COL is too long
2) Scratches in the ink on edge of the case mouth--insufficient 
crimp
3) Scratches in the ink just below the case mouth--too much 
crimp, you're crushing the case
4) Scratches in the ink on case at base of bullet--bullet seated 
crooked due to insufficient case expansion (not case mouth flare)
5) scratches just above extractor groove—bulge. Insufficient sizings or need to bulge bust.

Sorry, but all bottleneck cases will need trimming occasionally.

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Does the sizing die for that have a neck expanding ball like a rifle die or just a primer recapping pin and you then expand with a separate expander? If it’s like a rifle die the expander ball may be pulling the shoulder forward decreasing the headspace. Just a thought. 

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update and final.. as it turned out what i had to do is resize with a 40 sizing die after loading.  apparently the 357 barrel is tighter than the 40 b

 

thank u to all who responded to my request .

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  • 2 weeks later...

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