Comments on: The 6mm BRDX — a Longer-Necked Dasher

By: George Ulicny

George Ulicny — Sat, 08 Feb 2020 14:06:37 +0000

I have only the vaguest grasp of what is being discussed. But it would seem that 3K fps would lead to unnecessarily short barrel life, as with early .220 Swift barrels. Any remedy ?

By: Bob

Bob — Mon, 26 Oct 2015 02:44:12 +0000

Ray,
Shiraz told me the Dasher case length will be 1.553″.

By: Ray

Ray — Sun, 25 Oct 2015 14:34:50 +0000

The Dasher will be hard to dethrone, but I feel that the 6mm BRDX only adds to the Dasher’s short comings if it has any.. How long is Shiraz’s Norma Dasher brass supposed to start it’s life @?

Ray

By: Boyd Allen

Boyd Allen — Sun, 25 Oct 2015 13:36:51 +0000

Correction: I should have waited for the second cup of coffee to kick in. The shoulder angles are the same.

By: Boyd Allen

Boyd Allen — Sun, 25 Oct 2015 13:35:24 +0000

So, what is your reamer’s freebore specification,and how much bullet shank (bearing surface)is in the neck for the bullets that you have tried? With those bullets, where does the front of the boat tail (back of the bearing surface) end up in relation to the neck shoulder junction? Might if be that another advantage of this design is that it makes it easier to keep the bearing surface clear of potential doughnuts? I wonder if the longer neck and sharper shoulder angle will give a little longer barrel life (TP theory).

Editor: Boyd, Freebore is 0.120″ if I recall. Yes the base of the bearing surface on 105gr Scenars are ahead of the shoulder Junction. We had enough neck to shoot 90s and 95s too. The BRDX is very close to the Dasher — just a slightly longer neck. As you stated in your next comment, the shoulder angle is same as Dasher, both are 40 degrees.