Prograde 140gr TAC-XP case splits G29

[Intercooler]

    I had a member over on EAA Firearms FB page that contacted me with the following:

Howdy.  I have a 10mm question after my range trip today.  What's the best way to send you a picture?  I was terminal testing Prograde 140 TAC-XP and had two of three brass split.  It was my first outing with the G29 gen 4 so I'm not sure if it was the pistol or the ammo.  125 grain TAC-XP brass didn't split.

      I'm just waiting on the pictures to see if the 10mm crowd here can help us figure it out.

[The_Shadow]

If he can send the split brass and maybe a loaded round of each bullet for pull down, we all can learn a little more.

When we did the pull-down on the ones you tested, testing showed;

Prograde 125gr TAC-XP
EAA Limited Pro 4.75" 1679, 1723, 1703. Average = 1701.66 FPS/ 804 LBS

Prograde 140gr TAC-XP
EAA Limited Pro 4.75" 1428, 1453. Average = 1440.5 FPS/ 645 LBS

Pull-Down info here;http://10mm-firearms.com/factory-10mm-ammo-pull-downs/prograde-125gr-and-140gr-barnes-schp-pull-downs/

[The_Shadow]

It would be nice to see the primers as they sit in the cases...


I have had that happen with Re-Use of Hornady Brass, usually that indicates that the brass is too stiff to expand without, thus cracks like shown. Could be over worked alloy and/or improper annealing to make the brass soft and malleable...

[Intercooler]

If I had to guess this is Armscor brass with Prograde headstamp. They are all under one umbrella now and a long while back, I had an Armscor brass split.