I think my rifle port was at .097" the last time I checked. Found the same thing that these capacity cartridges are a little sluggish ported in the rifle position. I couldn't use any powder faster than 1680 in the 20 or it would borderline function but your 16 might like the W296 with the 110s and 125s. If your cartridges tend to roll inwards as you fill the mag try some Thermolds. They have shallower ribs like the Grendels and the rounds will stack straight down.
I am going to turn my attention away from the guns now and concentrate on ammo components. People are going crazy and I need to pick up all of the LC brass while I can get it and the M193 projectiles cheap. There is still a supply of 308 penetrators but i had better move quick or they will be long gone also.
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