I use 6gn of ICI Nobel Shotgun Powder No 78 which is quite bulky and very close to both Red Dot and AS70N. I'm using the same load for both 204gn HP GC and 185gn FP GC cast bullets from Robert Walker. I can get 5 of either into a 2- 2.5in group at 50m..the 204 gn are doing 920fps, the 185gn are doing 960 fps on average. Both sound exactly like a suppressed subsonic 300BLK from a DOC Culler's expensive rig according to my mate who has had to listen to a stash of Fallow on the Nth Shore get decimated at 3am in the morning. Not his stash but he has been enjoying the venison. I nailed the old Stag at 36m with a shoulder shot with a 204gn. Bang Flop. Having run out of my 25ct sample pack of those I got from Robert a few years back I picked up some subX to try also. Havnt got there yet but will start with the same load. For subsonic thats where I would also start with powders like Red Dot or AS30N. For jacketed bullets check they leave the barrel each shot.
Interestingly the Walkers were cast at .313dia for 303B..I found by accident that my old Interarms Mark X just loves them in that dia. It won't shoot .309 cast worth a damn.
Anyway FWIW
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