bulky fast powder alternative to Trail Boss?

if I can find the VV one, any idea on starting point to work down from?
Fill the case to where the bullet would seat, 70% of that number is where you should started so hypothetically if you have 100grs in the case at about where the neck and shoulder meet you'll start at 70grs. With a chronograph you'll determine if you need to go up or down in case volume.
 
I don't have any experience with jacketed subsonic .308Win loads. BUT if I were to want to experiment I would start with Unique powder. It's fairly bulky but also very flexible and not too spiky. I have used it to shoot cast bullets from my .308Win, 30-30, etc and it works very well in those applications.
 
Last I checked, unfortunately I dropped off the earth online last year and barely made it back to hear much less BOTL. I barely smoke once a week most months but I make ammo almost daily [emoji1]

he threw me out a long long time ago cause I wouldn't kiss his ass like all too many of them that went with him when he started that place... Same here, but i do get a cigar or two in during outdoor range days..