Trail boss

Tried trail boss in online muzzle loader couple of years ago. It worked pretty good unless you compressed it.shotgun primer would not set it off compressed. Trying to get cleaner burning powder than black or pryodex. Gave up and went back to pyrodex.
Derail...Blackhorn 209 is your friend...

OP, TrailBoss gives you case fill. That is what you are looking for. I wouldn't try anything that isn't listed unless you are going to stand behind a berm with a pull chord 🤣
 
You can use pistol powders BUT it's hard to find load data on them.

With pistol powders you cant fill the case up-- you just use a little.

I actually use green dot powder for subsonic 308w loads-- works well but took quite a bit of time to find start points for load data
 
Found this article on reduced creedmoor loads using 4895. Significantly reduces speed, However it's still a long way from subsonic.

 

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