case issue? or new reloader issue?

[sqlbullet]

I have a P16-40 that I converted to 10mm.  It has no other quirks.

Yes, TC or SWC bullet styles are far more sensitive, as well as any RN or HP design that has the ogive starting much past the mouth of the case.  It really seems to be an issue with the shoulder of the loaded round being over 1.05" more than anything else.

I run a bunch of 175 grain SWC, but have had the issue with other HP and RFN bullets from time to time.  If I keep my COAL below 1.250, I never have issues.

[The_Shadow]

For the converted Para16-40's, I have to wonder if the 10mm chamber reamers, also cut the throat taper as well.  The angle and width of the opening especially at the end of the chamber cut.  I could see where if the angle is too tight, it would affect the longer seated bullet designs with bore diameter portions a head of the casing mouth.

One thing I noticed in the Bren Ten barrel design was that there was long lead with respect to the rifling in the barrel.  It looks like about 3/4" before the rifling starts...

[Desolo]

I remember reading somewhere that the bren ten's rifling was different, and that it was a feature of some sort, but don't recall what it was supposed to do. Interesting though!

I've never had an issue with hollow points (yet) but its something I've been waiting to see it happen, seems like every auto has one it hates!

My Para is a single stack, do you run yours on the standard 16/40 mags with a spacer removed?
How long have you been running it as a 10mm? I'm not big on double stacks but ill admit a 1911 style pistol that has that many rounds of 10mm is pretty sweet!

I've been interested in trying the coated bullets but just haven't gotten around to it, I wonder how soft of lead one could powder coat? Itwould be neat to have a very soft slug coated well enough to protect the bore but still allow expansion....imagine a high velocity nyclad type round! That would be fun to try!

Well I've certainly got some stuff to think about and various things to try, so this is great!

[Desolo]

Just figured id throw this out there: I sat down tonight and chamber checked (barrel out of the gun plunk testing, and looking at how it headspaces in relation to the barrel hood) the last of my batch that I was having issues with, and wouldnt you know it, I had 5 failures, all of them in pmc cases.... so it sounds like they were in fact the issue, this next batch will have been pass through resized so when I get around to loading them ill do the same test again and see if I have the same issue, but I don't think I will 

[gandog56]

Just figured id throw this out there: I sat down tonight and chamber checked (barrel out of the gun plunk testing, and looking at how it headspaces in relation to the barrel hood) the last of my batch that I was having issues with, and wouldnt you know it, I had 5 failures, all of them in pmc cases.... so it sounds like they were in fact the issue, this next batch will have been pass through resized so when I get around to loading them ill do the same test again and see if I have the same issue, but I don't think I will 

All my strange 10mm brass goes through my Lee Bulge Buster. Also my .45 nd .40 cal.

Just in case they've ever even been within sniffing distance of a Glock.