Which powder for 30 Herrett?

I have a 10 inch 30 Herrett Contender barrel and was wondering what powder you guys are using. I am using AA 2230 because I was already using it on my 14 inch 223. Any suggestions?

What do you plan to use it for?
What Bullet weight(s0?
What powders do you have on hand?

RL-7 and 130gr Hornady SP (not SSPB) bullets works VERY well in my 10" .30 Herrett. It's a load that I've only seen in one place, I think an old Lyman manual.