Pushing back Dasher brass?

[Josh11]

I have been running a 6 Comet, a 6BR variant for the last two years. For those who don’t know, the Comet has a longer neck, different should angle, and less body taper.
My question is, could I push back the shoulder back on Alpha 6 Dasher brass and form? I’ve pushed on some trash pieces I’ve picked up from matches that people didn’t want anymore but I haven’t done anything with them. Would I have any donuts to worry about or any case separation?

 

[Stan Taylor]

Yes you can just push some Peterson back I did just the other day for my 6BR Vixen in which is a little shorter than the comet.

 

[Bjl4776]

I have taken some brass that started life as Lapua BR and formed to dasher and shot 10-12 times, pushed it back to brx and have shot it another 2 times. The brass was never annealed as dasher brass but I have annealed it every firing. It’s amazing how much movement quality brass can take and still perform. I don’t use that brass much, really just wanted to see if it could be done but I suspect I’ll lose primer pockets before any other failure.

 

[Josh11]

Yes you can just push some Peterson back the other day for my 6BR Vixen in which is a little shorter than the comet.

Are there any donuts and have to turn?

 

[Stan Taylor]

Are there any donuts and have to turn?

Yes after forming I expanded necks an took a clean up back towards the shoulders an importantly not concerned with donuts I'm seating a head of any.