Hey Lance, I just started using the 8133. I notice on this new seekins rifle the barrel has to be cleaned every 10 to 15 shots. Barrel has about 100 rounds through it right now. Did you notice any excessive fouling using 8133?28 Nosler,even in a SAAMI chamber, should be able to hit 3100fps when run hot in a 28" 1:8".
I run 3084fps in a load 1.5gr off max w. IMR8133 in my 26" 28 Nosler. I have loaded several different 28 Noslers over 3100 in 26" barrels.
IMR8133, N570, RL33 are the top go-to powders for the 28 Nosler. Retumbo gets you close too.