Wow I might even consider trying my 2002 full wonder finish compact with 10mm again.  Last time I tried with a henning rod and a wolff spring I already had with a super thin brass washer a round discharged without fully feeding blowing out a mag plate.  I'll try that flat spring anyways as I don't like the beating that pistol gets even with its 40 barrel in it (thin brass washer is pretty much gone with less than 50 rds).

Does this flat spring help with recoil absorbption or does it still beat the snot out of the frame?

Test fire a 1911 style first before deciding.  For my big hands it's not a very comfortable platform.

Glock 20 gen2 (pre clinton ban)

full weight: 31 (with hogue, glockmeister metal guide rod):
without mag: 28.2
slide assembly:  21
barrel: 5.8
frame: 6.5

ugh math doesn't add up on this one...also imprecise analog scale

Tanfoglio Witness compact full steel wonderfinish 2003

full weight: 36.2
without mag: 33.5
slide assembly:  15 (henning)
barrel: 3.8
frame: 17.2

Tanfoglio EAA Witness all steel wonderfinish 2004

full weight: 41
without mag: 37.5
slide assembly: 17.2 (henning)
barrel: 4oz
frame: 19oz

The case rupture in the all steel witness didn't alarm me nearly as much as the glock's rupture.  Yes my hand got some light powder scorching but the plastic mag plate cleanly blew out.  If the mag plate was aluminum like the replacement witness mag base plates tend to be I'm not sure where all that pressure would have gone.

I don't recall who loaded the ammo that was in the glock.  I think it might have been reloads done in wyoming.  Those 2 bullets were all I had left from whenever that happened in late 1990s.

The compact witness load that went was from ammovalley.  All the ammo I fired through the full sized frame and the glock 20 worked fine.  As I mentioned I was testing the compact with a henning rod.  After the case rupture I inspected every case that went through the compact and all of them showed off center primer hits similar to what you see in the picture.

I would probably attribute both case ruptures to the cartriges not fully seating in the barrel.  Inspecting the witness barrels the cartridge when seated is very well supported on the top and sides with just a little brass showing on the feed ramp side.  Better support than the ruger 10mm (reference the recent youtube video comparing chamber support of various 1911 style barrels).

Let me check..

witness case len: hair under 25mm
glock case len: right at 25mm

so cases seem to be in spec...

also both those old unfired sample cartridges very easily slide into and out of the barrel chamber.

And yes, both sets of ammo (old and new) were noticeably hotter than the factory rounds I've fired before (mostly weak assed american eagle).  This new batch not as hot as that old batch I think (lots of years ago though).

And I've never had case ruptures before with anything else, even when I reloaded 45 acp HOT (I reloaded a whole bunch just under max).

Just wondering how many of you have had case ruptures.

My first rupture was in the late 1990s with a gen2 glock 20 (bought 1996 for 470usd new) at a firing range where I had bought some of their ammo.  That one sheared the mag catch and blew the mag out the bottom.   Thankfully just the mag catch needed replacing.

I also have compact and full sized tanfoglio eaa witness pistols full steel in wonder finish, I believe 2003 and 2004.  No problems with the full sized one.  Both sporting 22# wolff springs.

I have a 40 barrel in the witness compact and have been having reliability issues with it.  I bought henning guide rods for both pistols.  A couple of weeks ago, just to test I stuck the 10mm barrel back into the compact.  During the first mag I had a case rupture.  This time it blew out the polycarbonate mag floor plate.  Primer strikes were off center so there's a good chance the henning was interfering with stripping and fully feeding the rounds.  It seems that changing out the 40 ammo fixed the compact's issues.

case on left is from the witness compact, case on right from glock 20.

I notice the cases are silver on these...not sure if that's an important data point...


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