Neck size 6BRA with Dasher

[FNG1001]

Im fireforming 6BRA brass. Looking to neck size only for a couple firings, while leaving the body alone to fully take the shape of the chamber.

I thought that a 6 Dasher FL sizing die might work, seeing how a 6 Dasher is 0.080 longer but with the same 40 degree shoulder as the 6BRA. Has anyone tried this? I'm hoping to not damage the brass, but also not have a messy kaboom go on in front of me.

 

[TylerN]

I'd guess the Dasher die might not enough neck to size the brass. You can try running a piece of brass through the die and measure with calipers if it's working or not. Just go slow because I think the BRA neck might bottom out first and you don't want to jam things up.

 

[TheOfficeT-Rex]

Dasher has 80k longer body, you won't get the BRA far enough up the die to size the full neck before bottoming out the ram/shellholder on the base of the die. You won't(shouldn't?) be able to touch the shoulder.

ETA: This would also size the BRA body, since you'll still get the sizing action of the die at the .200 line. You really need a neck die or a chamber drawing if you're trying to match dies.

 

[mbeavers1]

Im fireforming 6BRA brass. Looking to neck size only for a couple firings, while leaving the body alone to fully take the shape of the chamber.

I thought that a 6 Dasher FL sizing die might work, seeing how a 6 Dasher is 0.080 longer but with the same 40 degree shoulder as the 6BRA. Has anyone tried this? I'm hoping to not damage the brass, but also not have a messy kaboom go on in front of me.

You are going to get >99% on the first firing...way good enough for load dev. I wouldnt worry about it and just FL size. Maybe bump 0.001 instead of 0.002-.003, but even thats not really needed.