STOP!!!!
If you're loading this for use through a suppressor, you have two BIG problems..if you just want a light load, you only have one...
.308 subsonic is tricky to load, and improperly done can BLOW YOU THE FUCK UP, as well as destroy your suppressor.
I
buy my .308 sub, because the problems involved with loading my own are too much for me to want to screw with at this point in my life.
If you have a 1:12 twist barrel, like most Remingtons, you can't shoot any of the heavy subsonic i.e. greater than 180gr. They won't stabilize. If you have a 1:10, like on the Savage, you can shoot the heavier stuff, but be on the lookout for signs of instability.
I use TTI Armory 170gr .308 sub, it's a buck a shot, but it is 1 MOA accurate out of my rifle, and won't blow the end off my can.
www.ttiarmory.com