I currently run 32SBK over 26.2gr Vit N135, Rem 7.5 @ 3650,18" with reasonable accuracy, sub 0.3"
Case max fill is 28gr using Hornady brass way below QL max,
28gr gives 4000f/s in a 20" pipe with 32's but if you want to shoot out to 500+ I would run 39 SBK over 27.8 gr N135 Rem 7.5 @3750 f/s 20" and has a much better BC
These loads were worked up by myself and safe in my guns and are meant only as a guide