VV N110 is an excellent choice & I think I'm switching to that in my subsonic loads due to temperature related velocity changes w/H110.
Sierra has load data both super & sub for VV N110 & it is their recommended powder in most of their loads.
I may be wrong but I think you HAVE to put a can on the gun or there isn't enough pressure/dwell time to cycle.
That's my experience anyway.
I do know that M1S has a very light weight 300-221 buffer & spring that might cycle w/o can but I'm not sure.
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