Zoner,
I agree that IMR 3031 is the best powder for full house .30-30 loads. IMR 4895 is a good powder for many loads and it is very versatile. I have gotten great accuracy in other calibers with it and, as I recall, it is a very good powder for autoloaders. I also agree Unique is great for reduced lead bullet loads. If you go nuts with it, you will have a big mess in your barrel to clean up. Better make sure the lead bullets are very hard or gas checked. H335 is a great .30-30 powder too. 3031 was used in much greater quantity in .30-30 loads in the old manuals. Make sure you use the modern data so we can keep you around.
BT53