Modern Sporting Rifle Evolution
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JW6964

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Reply with quote  #1 
Has anyone loaded this round? I just bought a G31 and I’ve been setting my dies up. I purchased several factory load to measure and shot for headspace. I ordered some once fired brass which measures about .030 longer than the factory loads. I have not shot the gun yet so I don’t have a fired case to measure for my specific barrel. My dies are set up to size the cases as much as possible and I can only push the shoulder back .012. I made some dummy rounds that cycle by hand just fine.
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MDWS

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Reply with quote  #2 
I do not have one therefore nor have I loaded for one, but have always been curious about it. I've seen some guys post some things elsewhere, but...
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RangerJoe

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Reply with quote  #3 
I love this cartridge... it is one of my most favorite pistol rounds which I adopted in 1994.  I have a Sig P-229 and P-226 chambered in .375 Sig.  I also bought a Bar-Sto 1911 Combat Commander barrel in .357 Sig, but haven't converted any of my 1911s yet.  When I first got my 229, ammo and brass was nearly unobtanium.  I made my first 1,000 rounds from .40 S&W brass.  The case OAL is a bit shorter than spec .357 Sig, and despite dire warnings of imminent death and dismemberment - they have shot perfectly for 20+ years.  Technically (according to SAAMI), the .357 Sig headspaces on the case MOUTH, not the shoulder.  However, thousands of reloaders have converted .40 S&W brass which we headspace on the shoulder without an issue.

So - if you are using .357 Sig brass, case length is perhaps more important than shoulder; however, excess shoulder working should always be minimized. 

My suggestion: Fire some FACTORY rounds, then set your dies for .004 (+/- .001) shoulder bump and confirm your trim length... then call it a day.  You will love the performance and accuracy of this round.


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JW6964

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Reply with quote  #4 
I picked up 1000 pieces in 357 sig from Georgia Brass which was 99% Speer. Of the cases I checked, the length was close to the trim to length. I was just surprised that the factory rounds measure .030 less than the once fired brass. Once I fire a few I’ll get a better idea of where the shoulder needs to be. I liked the round because it’s a bottleneck pistol round that sends a 125 gr bullet over 1300 fps.
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