If shooting the heavier bullets like the 110 NAB, and 115 Bergers, I'd try IMR 7828 SSC. But I would definitely start low and work up because it is a very slow powder that produces alot of pressure.
I use 7828 SSC behind Berger 115 VLD's in my .25-06 AI, in fire-formed Winchester .270 brass, with a Fed 210M primer. Shoots great, and has awesome velocity.
I prefer 26" barrels at minimum on my centerfire calibers. But that's just my personal preference. I also shoot a 1:10 twist for my .25 cal rifles. The 1:9 twist would allow for some really heavy bullets, which might be good to stick with that, if that's what you plan on shooting.