Hate to ignore this thread as some might jump all over the understanding of my experiences. So, guess they are gonna jump.
Thought i was getting pretty good at 600 yards with my multiple Dashers. Then the BRA craze came a few years ago. Man I spent thousands and jumped on that BRA bandwagon. Had visions of being another Tom Mosul or Bart Seuter. Ended up being just a dumb Pollock as always.
Dashers and Varget - a match made in Heaven. Only now it had to be H4895 with the BRA. Me and that powder never got along. Velocities over 3,000 fps were easy with the BRA. To get accuracy I played and still do, around 2,960 fps using 105-105 gr. bullets. My Dashers using Varget shot and still shoot well at 3,020 - 3,030 fps. Varget and my BRA always seemed to be at odds.
Test, test, test with every BRA combination I could find. Sometimes they did shoot small - once. Next time, awful. Wore out one barrel, then another, then got pissed at more barrels and still playing with more on two different actions. One was formerly a Dasher and the other a "million-dollar" build for BRA. Never have they been consistent like my Dashers.
Got into the custom bullet craze and blew more money. All the talk of great shooting with BRA had me stoked to spend more money and do more testing. Still shot like the dumb Pollock I am. Modified my newest BRA rifle extensively. Just now am I getting a bit of consistent results. Back to Varget? Maybe away from the 450 primer to the BR4's. Slow down. Using a different brand barrel that is 5R and 7.5 twist instead of the 8's. Back to the Dasher barrel length of 30".
Well all this time I kept another of my rifles a Dasher. Two perfect scores on the last two steel shoots I used it in. Couple tests on paper and solid, no flyers at 3,030fps using plain old Berger Hybrids. Getting another barrel ready with a new Dasher reamer I just got. Excited when I can try new things but the old Dasher has 1,900 ads through it and is near unbeatable. Even my gunsmith trashed his new BRA build and is building another Dasher like of old.
Other than Bart, I have yet to see anyone shoot a BRA with consistent great results at Manatee in South Florida. Dashers rule but lots sure climbed on the BRA bandwagon. Glad it was not a rocker as so many right now are falling off.