Anyone come up with a action Cycling Subsonic Load yet

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My barrel is 1:8.75.

I was surprised to read that "Trail Boss" didn't get you enough velocity. It worked great (except for cycling) in my 10.5" upper. I guess those long 160 gr. telephone poles have too much friction for that powder in barrels as long as yours.

I haven't had time to tinker with mine for a while, but I might give it another whirl this year when the weather gets better. I should probably just give up and start over with my 14.5" upper instead, but I'd much rather get the shorty running.