Sig P365 chamber support

[CapnMac]

In self-loading pistols, usually the debating dilemma begins with how the barrel is "ramped" (if at all).
What seems to occur is that more credence is given to barrels where the ramp protrudes from the rear face of the barrel. And the least credence given to those where the barrel is slightly undercut at the chamber so as to not need a pokey-out sort of ramp at all.

Such thigs are often debated, and hotly, with little or no actual experience by owners using factory-spec ammo. (And, often, with many citations of circumstantial, second or third hand accounts of badly-assembled ammo.)

So, this winds up a "hot topic" online, sounds and furies, oft told by idiots, signifying nothing.

 

[Tinman357]

If you're shooting a spec factory load and not bulging the cases then you have a fully supported barrel.

 

[JohnKSa]

After that experience, it became apparent that some ammo may work fine in some autoloaders but may not work so fine in other autoloaders and you need to know which ammo works for the gun you may want.

Good ammo should work in any autoloader, bad ammo may be a problem in any autoloader. It is absolutely NOT a case of "Buy Brand B ammo for Brand Y gun or you may blow a case." as long as you stay with ammunition that is loaded properly and is a match for the gun's chambering. If the ammo is loaded properly then it should be safe in any gun chambered for it, autoloader or not. If the ammo is not loaded properly then don't shoot it in any gun, regardless of the chamber support.

...the person firing it should have been aware of what ammo worked with his handgun.

Unless the person had overloaded the rounds, or knew they were shooting overloaded rounds, I don't think you can blame them. Quality Control is a major factor in ammunition manufacturing, but even the best company can let a bad round slip out once in awhile. The incident you experienced was almost certainly due to improper ammunition, whoever manufactured it. The idea that some guns, due to chamber support variations, are unsafe to fire with ammunition that meets SAAMI specs and that is a match for the gun's chambering is just not correct.

I don’t know that it was a handload but what I do know is that it was an excessive pressure load for that handgun. Just trying to establish what that might be for the P-365

The P365 is rated for 9mm+P ammunition, so if the ammunition conforms to that specification and is manufactured properly it will be safe in the P365. No need to worry about chamber support.

 

[Walkalong]

I don’t know that it was a handload but what I do know is that it was an excessive pressure load for that handgun. Just trying to establish what that might be for the P-365

At or under SAMMI max +P pressure loads. Don't try to push your luck, it is what it is, a short barrel, but a great gun that will serve you well. Love mine.

 

[Rodfac]

I"m past 1500 rounds in my 365, factory and a bunch of handloads that approach max from Lyman and Speer current manuals....I"ve had no problems & with zero case bulging. Hand loading is or should be precision task requiring adherence to accepted and tested limits....The P365 is a well engineered, thoroughly tested pistol.... I sincerely hope YMM does not V. Rod

 

[lysanderxiii]

 

[doubleh]

During the time I owned a 365 I had no bulged case with it. I gave it to my daughter for her carry gun. My SIL has owned one since before I did and still has it. No bulged brass with it either. That is all the information I have to offer.

 

[halfmoonclip]

The early Glocks, firing hot .40 S&W (we might recall the .40 arrived, full blown, as a warm load) had issues with 'smilies' on spent brass, and it was reputed that brass wouldn't reload.
This problem made the shooting community aware of the possibility; it never happened, to my knowledge, with nines or .45s.
The issue soured me on the .40, and I've been keeping an eye on my brass, in any caliber.
Moon

 

[JohnKSa]

The early Glocks, firing hot .40 S&W (we might recall the .40 arrived, full blown, as a warm load) had issues with 'smilies' on spent brass, and it was reputed that brass wouldn't reload.

There was also an issue of some bad .40S&W brass early in the history of the caliber from Federal that may have contributed to the general perception about .40S&W and Glocks in the caliber.

 

[9mmepiphany]

This problem made the shooting community aware of the possibility; it never happened, to my knowledge, with nines or .45s.

It was pretty much limited to the .40 S&W.

I wondered how common the issue was until I saw that Redding offered a system for actually dealing with it. Unusually since Redding dies aren't inexpensive and you wouldn't think they'd go to the trouble and expense to design a system unless the issue was fairly wide spread. Their design was limited to addressing the issue with only the .40 and specifically to the Glock chambering, as they named it the G-RX (Glock Prescription; or Prescription of Glocks)