I tried the 143 HH pushing them at 3,650 at max pressure with 91gr N570 in Nosler brass seated at the second gas ring. I just couldn't get them to group consistently. My chamber was cut for the Berger 180-195s though. Keep us posted.
It looks like our 28Ns are chambered similar. In the absence of 195s, I went with the 143 hammers and N570. 92gr with a 3.6 coal in Norma brass... far from the lands, but getting 3686fps. I get a decent ejector mark, but no funny business with the primers/pockets/bolt lift. Thanks for the notes.
The most impressive thing about this thread was that OP had virgin ADG brass. @Huntnful what is your coal if you're .07 from the lands? Was that max length for reliable feeding or was it a result of load development?