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Discussion Starter · #1 ·
I fitted a Bar-Sto MT 357 sig barrel to my glock 20,I took it for a test fire and had some problems with the brass splitting at the neck,runs down about .300.The factory rounds I was shooting were 100gr.Federal Ballisti Clean ,brass case,I also shot a handfull of Winchester 125gr SXT nickel case rounds and did not see the same splitting.Fired cases measure about .379-.380 at the mouth,the body of case is .426.I never owned a gun in 357 sig,so I do not know whats the norm,feel free to give me any feed back. I am thinking I my send it back to Bar-Sto let them check the chamber dim.
 

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Did you finish ream the barrel? Bar-Sto barrels normally require finish reaming and it may be possible that the cartridge is not fully seated when firing.
 

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Discussion Starter · #3 ·
Scottly
Yes I did finish ream the barrel and checked the head space with the proper gages. nothing cheap about the cost of chamber reamers these days
 

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Could be defective brass. Ask Federal if they've had any reported problems. If possible, have the box w/lot# handy.

You could also make a chamber cast with CerroSafe, then mike and compare with correct chamber dimensions.
 

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Discussion Starter · #5 ·
retDAC,
I feel the chamber is good ,it was reamed and checked with the gauge.It could be the brass.If any one has the time to measure the neck on some of there fired brass and post it that would be a help,also what gun it was shot in to do some comparison.If I were make a cast of the chamber where would I get the correct chamber dim. from?
 

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I tried looking online for the SAAMI chamber specs. They had older cartridges, even .40 S&W, but no .357 Sig.

Neck splitting in factory loads with new cases from reputable mfrs is almost always bad brass. Contact Federal first.

If that seems not the case, contact Brownell's or SAAMI for the chamber specs. Your chamber gauges won't indicate an enlarged throat since they are for a bottlenecked cartridge which headspaces on the shoulder.
 
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