These are just the second group of 30 down the barrel, and they're also all virgin brass. It's somewhat of a guess of a load of N570 with the A-Tips. Definitely a random seating depth. I'm hoping that I'm close enough to a decent load that I can make one more trip to the range to tune in the seating depth a bit before the 8th - that's when I'm heading out to the hills for some ELR fun and I wouldn't mind lobbing a few a long way down range.
My brakes have simply been getting some Q-tips dipped in BoreTech carbon remover then hitting them with a nylon brush.
I may pop 'em off and put then in the ultrasonic now.