Powder suggestions

[Snowbird]

I'm going to load for a suppressed 20" bbl 270wsm with 156gr hammer hunters and want to get the most out of it I can. For my purpose, accuracy trumps speed but I don't want sub 270win speeds either. In a previous 24" bbl this rifle shot well with slow burning powders like imr7828. In a 20" bbl I feel like there'd be too much unburnt powder barking out the muzzle. I still have some h4831 and a little h4350 but am willing to look around for some others.

So, what powder would get the most complete burn in this situation?

 

[Zen Archery]

Search "Official Hammer Hunter Load Data"

 

[budlight]

StaBall6.5 in 270wsm is really good powder. I use a 24 inch with a can.

 

[droptine]

I used to load bases on what looked to be the best for cal., bullet etc. Now I load bases on what I have or can buy which sure as heck is not RL 22 in my case LOL.