ADG Brass primer pocket opens

[Ironworker]

I've been replicating the loads in the Hornady 11th edition for 6.5 PRC, burning Re#26, and pushing a 123 ELD bullet. Even the starting load opened up the primer pocket on the recently purchased brass.

 

[SKWERLZ]

What speeds?
You do realize ADG volume in a good bit less and needs to be accounted for.

My experience with ADG brass in 7 saum and 338 edge is that brass is quite tough.

 

[markm87]

Yep. We have ADG in 300WM and 6.5cm. The primer pockets are short lived.

In 6.5cm, Hornday's bulk brass holds up better, but for pinky up ammo, I'm running the Lapua small primer stuff.

 

[RegionRat]

I've been replicating the loads in the Hornady 11th edition for 6.5 PRC, burning Re#26, and pushing a 123 ELD bullet. Even the starting load opened up the primer pocket on the recently purchased brass.

Ironworker, I'm curious if you also saw a before/after change in the case head diameters, or just the loose primers?
Do you still have samples of virgin brass? It would be good to grab dimensions and see if the case diameter versus the chamber has anything to do with this? (0.532" ?)

By chance, has this same rig done well with other virgin brass or factory brass? It would be a good comparison to see if there is a difference there too.

 

[Ironworker]

Ironworker, I'm curious if you also saw a before/after change in the case head diameters, or just the loose primers?
Do you still have samples of virgin brass? It would be good to grab dimensions and see if the case diameter versus the chamber has anything to do with this? (0.532" ?)

By chance, has this same rig done well with other virgin brass or factory brass? It would be a good comparison to see if there is a difference there too.

View attachment 1431813

Virgin Brass measures .5295. Are you familiar with problems with the 6.5 PRC chamber and dies not sizing the brass down enough? The sizing die wasn't the problem; it was the chamber. I rented a new chamber reamer. I believe it was Alex Wheeler specs and opened up the chamber; it solved all my extraction problems on 3x firings of brass. This lot of ADG brass once fired measures .5325! I've been told if the brass measures more than .001, the load is too hot. But all the ammo extracted just fine, and it shot so well! Also, Lupua virgin brass and fired brass are the exact dimensions, I just sized and seated a primer in Lapua brass that had a charge 56.8grs of N560 behind Berger 135, the primer was a snug fit.

 

[Ironworker]

What speeds?
You do realize ADG volume in a good bit less and needs to be accounted for.

My experience with ADG brass in 7 saum and 338 edge is that brass is quite tough.

About 200FPS faster(28" bbl) than posted velocities in Hornady 11th edition. My best load had an SD of 6.2, 1/2 moa groups extracted just fine.

 

[SKWERLZ]

You can be well over rated pressures and still extract fine and get a good SD.

200 over tested book data is pretty spicy especially considering ADG almost certainly has less volume than Hornandy brass Hornandy tested.

 

[mikecr]

Curious about any opening at the .200" datum.
I'm thinking too much clearance down there. Not enough breech support.

Why would you open a chamber -for a die?