I have one of each above the br has a 12" twist and the dasher has a 8" twist. I will be shooting 600 to 700 yds at steel targets (10"- 6") , both rifles are accurate .5 moa at 100 yds. The rifle in question for the rebarrel is a ruger num 1 220 swift varmint with a pitted barrel that won't shoot, seems to me the dasher cases stretch less then the br and are easy to fire form. The new 6 br would have 8" twist this time so i can shoot high ballistic coefficient bullets what do the pro's think?. (please stick to the cartridges mentioned because i have dies for both).
Thanks

Dasher......

Dasher. Competition shooters love them.

Br, longer barrel life, less powder, longer neck, no fire forming and easily reaches the distances you shoot.

Norma makes factory Dasher brass now.

I get 2820 fps in 25 inches of barrel in a straight br with varget and a 105 berger.. Have a 600 yd berm and see no advantage with the dasher. Real world velocity difference with 2 local dashers is about 150fps. One of my dasher shooting friends is shooting 115 gr still a little faster than I shoot 105s.. Details, details! You can't go wrong either way.

They sure do and its junk. Br loads loosen the primer pockets