Peterson 6 Dasher Brass

[Ccrider]

I bought my Dasher used and it was my first experience with a wildcat. The introduction of the Peterson brass was what pushed me over the ledge so to speak, because I didn't want to fireform. I had the same failures to fire as you, and didn't know what the heck was going on until I got my Harrell's die. I used the gizmo they send with their die to determine there was a big difference in shoulder length between the new and three fired brass. I figured my chamber was just reamed too deep. Like you for the rest of the batch I hard seated some old Speer bullets and used CCI400's to form the rest. So much for not liking fireforming.

The other thing for me is the necks were too thick for my .272 "no turn" chamber--I had to skim cut them. Now that I have so much invested in this brass, I sure hope it holds up.

Looks like that rig of yours is going to be a real shooter.

I hope you are right. I spec’d my reamer for a .2735 neck. It is working fine no turn. The bullets easily drop in after firing.

 

[Ray123]

When you start loading them, be sure that your primers seat below the case head. I had some of their brass that had shallow primer pockets and had to cut the pockets deeper.

Alpha brass primer issue... their primer pockets have a slight taper....BR4 will not seat to the bottom easily their priner cup is straight and consistent along its diameter....change to Remington 7 1/2 primer, which have a smaller dia at the anvil and taper up to the same dia as the BR4 in short order...the little taper on the 7 1/2 gets you to the bottom easily ...you will feel the "double seat" with Remington primer. Great brass so far, accurate and takes some stout loads...on the 3 firing of 300...just tight primer pockets, that should stand up hard use, and getting single digit S/D with the 7 1/2, not much difference than the BR 4...Running 110 SMK at 3056 Ave fps, with 7.5 S/D...when tbe primer pockets loosens up go back to the BR 4 if ya want...or ream them all. But the depth is good on all of mine it's the diameter that's tight, I reamed one and measured to find out.

 

[NC/Br Shooter]

When you start loading them, be sure that your primers seat below the case head. I had some of their brass that had shallow primer pockets and had to cut the pockets deeper.

Is this why All my primer pockets are loose after 2 firings?

 

[DocDoc]

Treece, if primers seat fine at the start and loose after 2 firings, back off on the juice. You should get acceptable accuracy at a lower pressure. Of course, it is your money, so if 2 firings and the brass is done, your choice.

 

[Louisiana Shooter]

Mt thoughts go like this: If you have to fireform the brass......even though it's already suppoded to be "dasher'd"......then why not just use standard 6mmBR brass from the get go? There won't be any reason for all of this other stuff y'all are doing. Make a false shoulder and then fireform.........done.

Besides..the 6mmBR brass is cheaper than the Dasher brass.