Parabellum Research PBR V Supreme 165gr FMJ (from Chucky2)

[Intercooler]

Just glancing things over it looks like the 22lb setup gave better results. 1194?

[The_Shadow]

Yes it did and ejected brass was slightly less for the 22lb as well.  I sent a copy of the report to Chucky2, he was seeing issues with the ammo in the Glock 20 Gen4.  However many were seeing the failure to feed, failure to pick up the last round in the mag, and some rounds were jammed into the feed ramps or just to the left of it.

The only thing I noticed when I cleaned the G-20SF up was a bright deposit of brass on the breech face, where the case heads where striking it after ignition, during and under recoil.  Other than that the rounds burned very cleanly, of course Power Pistol is one of the cleaner burning propellants.

[4949shooter]

Just glancing things over it looks like the 22lb setup gave better results. 1194?

1191 actually. I am wondering if this was due to an inconsistency caused by the 17 pound stock spring or if it was a weak loaded round.

[Intercooler]

That's bad for even a stock recoil sprung Glock. I think that reading was a Chrony error.

[The_Shadow]

I would agree its probably a chrony error, wind was blowing things around, one of my homemade diffusers was blown across the  field before I set up, and my cardboard target also flew out into a large puddle.  Winds about 35 mph, as the backside of the passing front approached...It wasn't the best day to be out there, some places had 2" of standing water on the concrete shooting lanes and mud 1" deep in many areas.

It's possible the chrony was being shaken (not stirred) by the wind, even some of those lower 1200's could be because the 1st sensor caught the back of the bullet and the last sensor saw the front.  That would affect timing.

Lets just say it wasn't ideal conditions.

However the main part of the testing was gun functions,  I shot singles, double taps and triple taps, testing for any failures that could possibly cause a stoppage.  However the Glock-20 SF pistol was flawless in stock configuration and with the use of the non captive Wolff recoil 22lb spring setup using different magazines, loaded with varying amounts of the ammo.

[Intercooler]

   For those of us who don't know the changes in Glock Gen's from 3 to 4, do you have any idea about the magazines being any different? Right now the only thing I see that might be changed to create what the owners are experiencing is the recoil spring assembly.

[The_Shadow]

It is said the gen 4 magazine has an ambi cut on the front to allow ambidextrous use of the mag release, internals are the same though.

[Intercooler]

  I think that means you could still use the Gen 3 magazines? Has anyone tried that?

[4949shooter]

You can use Gen 4 mags in a gen 3 no problem.

I believe you can use a gen 3 mag in a gen 4 if the magazine release has not been moved to the right side of the grip, but not vice versa.

[Intercooler]

Someone with both give it a go and report back 

[4949shooter]

Someone with both give it a go and report back 

Buy a Gen 4 and I will send you a gen 3 mag to test. 

[Intercooler]

  Don't turn me on to that pain 

[chucky2]

Just wanted to say thanks again for doing all that, along with everything else you do for the 10mm community.  Question:  Where does this rank as far as power on the 10mm scale?  Medium High?  High?  Just medium?

[Intercooler]

Those are very strong upper medium giving 1345 FPS/ 662 LBS.  Over 600 LBS is real 10mm and over 700 is in the Nuclear range.

[chucky2]

But it's not outside the design spec of 10mm right?  What I'm working towards is this PBR isn't something so hot on the 10mm scale that a 10mm pistol shouldn't be expected to handle it, right?