I have no experience of 2206h or 4895 in sub-X loads - but I'm using the 175gr Sub-X in .308 with 9.5gr of Trailboss to the cannelure on the bullet with a crimp. Stable in 1-10" twist, 20" barrel and 1040-1060 FPS from memory. Hitting at 50m about 6" down and slightly to the right from a 1.5" high at 100m supersonic load zero.
I am happy with this load, started at 10.0grains which was about 1180FPS and crackling down the range (right on the supersonic speed) and dropped it down 0.5gr to keep it sub. I would start a little higher (there's a guide on the ADI site if I recall where you work out the case full with the pill in and work out the 'safe' start load with trailboss). You then work down to a safe subsonic load without the can on and confirm it's stable and then try it with the can on.
I would not be keen to use a filler with a suppressor, just with the risk of filler material catching in the can (at the very least with most cans it would be an utter arse trying to clean it out of them).
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