I've got 500 190 SMK's that I'm going to try with the new Alliant Power Pro 2000 MR. It is a ball powder specifically designed with the heavies in .223, and we know those powders also work well with heavier bullets in the .308 too. It's supposed to be more temp stable, we'll see. I don't think the RL 17 works well with less than 200 gr. bullets in the .308. I think the 2000 MR will work well with the 180-190 class a little better.