Could 6ppc be formed from 6arc?

[Bat Rastard]

Push the shoulder back and trim.
Would it be practical? Would it be better than expanding 220 Russian?

 

[457ciSBC]

I haven’t sacrificed any ARC brass to verify, but it should be relatively easy to do as you only have to bump the shoulder back .045 or so. However; until Lapua shows up with an ARC case you lose the benefit of a much better donor case, the 220 Russian.
I guess it depends on your end goal, when one looks at the advertised initial ad velocities from June 2020 and compare those to the later published Hornady gas and bolt gun loads it obvious that those ”ad” velocities are in the higher pressure bolt gun range.If I was going to chase those higher velocities, I would certainly favor a more robust case. Thus, what’s your goal with the 6PPC brass?

 

[ebb]

Is Hornaday the only maker of ARC brass?

 

[457ciSBC]

I haven’t sacrificed any ARC brass to verify, but it should be relatively easy to do as you only have to bump the shoulder back .045 or so. However, you lose the benefit of a much better donor case, the 220 Russian.

Is Hornaday the only maker of ARC brass?

At the moment, yes.

 

[ebb]

I have 6ppc Lapua cases that came with my rifle. No telling how many times they have been shot. I doubt Hornadays will live that long.

 

[457ciSBC]

I have 6ppc Lapua cases that came with my rifle. No telling how many times they have been shot. I doubt Hornadays will live that long.

Exactly, Lapua is the higher pressure benchmark donor.

 

[457ciSBC]

Push the shoulder back and trim.
Would it be practical? Would it be better than expanding 220 Russian?

You could always send 220R brass to DJ and have him hydroform it to 6PPC.

Cartridge Brass Service

Annealing, Hydro-Forming, Neck Turning, Ultrasonic Cleaning, Case Resizing or False Shoulders for wildcats!

djsbrass.com

 

[DiffEQ]

For those who might try, pushing a shoulder back 45 mils sounds easy. In reality, much more difficult.
You must work the brass v e r y s l o w l y or you will just crunch the shoulder body junction,, or fold the brass at the neck / shoulder.

 

[ebb]

Yea that has not proven to be the case in my experience. I have over 100 cases that are 30BR that were made from 308 lake city brass that I made with one stroke of the press. Ever seen a 30BR case that has a neck over an inch long? Guffey was wrong with the right die you can move the shoulder.

 

[anschuter2013]

Push the shoulder back and trim.
Would it be practical? Would it be better than expanding 220 Russian?

Try using Lapua 6.5 Grendel to form 6PPC. No body taper to blow out and brass is usually available.

 

[WyleWD]

Has anyone heard or have knowledge of whether Lapua, Norma, or Peterson plans to offer 6 ARC brass?? WD

 

[457ciSBC]

Yea that has not proven to be the case in my experience. I have over 100 cases that are 30BR that were made from 308 lake city brass that I made with one stroke of the press. Ever seen a 30BR case that has a neck over an inch long? Guffey was wrong with the right die you can move the shoulder.

I agree here, the key is making sure that the neck and shoulders are well lubed and it helps minus the decapping assembly.

Pushing the should back the thickness of 3 business cards is a POC. Also some presses are better that others for forming cases. I do all my forming on a good ole Rock Chucker.

 

[457ciSBC]

Has anyone heard or have knowledge of whether Lapua, Norma, or Peterson plans to offer 6 ARC brass?? WD

On the surface from the outside looking in, it seems Lapua and Norma would be the easiest.

 

[Dusty Stevens]

Whats the flash hole size? That may be yet another reason to not use hornady brass over lapua

 

[shoot4fun]

Whats the flash hole size? That may be yet another reason to not use hornady brass over lapua

When I shot short range BR it was always with 6PPC and always Lapua 220 Russian as a basis for my brass. That said, IIRC, in the beginnings of the 6PPC the developers used 7.62x39 brass. In fact, and I may be historically inaccurate on this, didn't Lapua add 7.62x39 brass to the line just because of that fact?
What brass and size flash hole was there in the beginning? The short range game is, in what I refer to as the "modern era" a game where one must shoot small .1" groups and even sneak in a zero now and then to be a winner. IMO, if one chose to make PPC from 6ARC brass would they not already be behind the eight ball before the flash hole size is even considered?

 

[Dusty Stevens]

When I shot short range BR it was always with 6PPC and always Lapua 220 Russian as a basis for my brass. That said, IIRC, in the beginnings of the 6PPC the developers used 7.62x39 brass. In fact, and I may be historically inaccurate on this, didn't Lapua add 7.62x39 brass to the line just because of that fact?
What brass and size flash hole was there in the beginning? The short range game is, in what I refer to as the "modern era" a game where one must shoot small .1" groups and even sneak in a zero now and then to be a winner. IMO, if one chose to make PPC from 6ARC brass would they not already be behind the eight ball before the flash hole size is even considered?

We used 7.62x39 only when lapua dried up for a bit. It was the most awful thing that ever happened to br. People were super gluing primers into lapua brass to get by

 

[shoot4fun]

We used 7.62x39 only when lapua dried up for a bit. It was the most awful thing that ever happened to br. People were super gluing primers into lapua brass to get by

You know, I've heard argument after argument over the small versus large flash hole over the years but never any specific reason why the small is expected for PPC and BR use. I wondered that it may have been to "control" burn but what you're saying (if I understand) is that running higher pressures as we tend to do with these cartridges the small flash hole allows for less "back pressure" on the primer and deters blanked and blown out primers.
I do remember the PPC cases being pretty well full of N133 when I was shooting.

 

[Dusty Stevens]

You know, I've heard argument after argument over the small versus large flash hole over the years but never any specific reason why the small is expected for PPC and BR use. I wondered that it may have been to "control" burn but what you're saying (if I understand) is that running higher pressures as we tend to do with these cartridges the small flash hole allows for less "back pressure" on the primer and deters blanked and blown out primers.
I do remember the PPC cases being pretty well full of N133 when I was shooting.

You can tell a difference in aggs even drilling them out with that uniforming bit they used to sell that made em like .065 or whatever it was. You can really tell if you get into the grendels and use some of that .080 brass. Dasher is the same

 

[gunsandgunsmithing]

You can tell a difference in aggs even drilling them out with that uniforming bit they used to sell that made em like .065 or whatever it was. You can really tell if you get into the grendels and use some of that .080 brass. Dasher is the same

yep

 

[Mulligan]

You can tell a difference in aggs even drilling them out with that uniforming bit they used to sell that made em like .065 or whatever it was. You can really tell if you get into the grendels and use some of that .080 brass. Dasher is the same

There is some testing being done now on the flash hole question with Alpha brass...... we will see how it unfolds.

Alpha 6BRA brass

So anyone that received these put them through the paces yet? Any range data yet from them

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CW