'Stick...you know how much I love the BR cases and most any mutations built off it. Even off the 30BR, I've done the 30BRX and 30 WolfPup (outrageous to the extreme).
For me, it's darn hard to make a case (pun intended) for a Dasher over a standard BR for anything short of a very, very niche' application.
For the 'bigger' 30BR's, we did it because H4198 (the powder of choice) is borderline slow and any faster powders are too much of a leap and came up to over pressure too suddenly to be able to stay in tune over a days competition. So, the increase in case capacity was an effort to make H4198 'think' it was 'faster'.
In the 22 and 6 Dashers, the same applies. For launching the big heavy stuff, a little more case capacity is helpful. My pals that shoot registered 600-1000 yd. BR competition that play with all the case variants tell me that day in and day out, it's hard for them to see any difference. And these are guys that seriously know how to shoot and tune...serious as a heart attack types. No B.S. and just- the- results- matter type of guys. Pressure is your friend with the BR case and the Dasher helps deliver that with the longer bullets...not so much the weight as the jacket contact area.
I'll swim against the current a bit and opine that the Dasher in both the 22 and 6 versions are at their best with twists in the 1:12-1:13 range, modest bullet weights that have great-for-the-weight B.C.'s (think Nosler BTips and some of the VMax offerings) at upper end velocities that the larger Dasher case volume offers. Laser-ish trajectory is critical for 'dogs, foxes and coyotes. In that application, the 22 dasher is surprisingly harsh on the throats. The 6 Dasher is much better in that regard. I have one 22BR that has a Lilja 3 groove for just that reason.
I'm doing a new build BR-cased gun now for myself and after clicking the boxes on the pro and con sides of the page, a simple no-turn 22BR got the nod.
Just my thoughts on a Saturday morning. -Al
