Hmmm. I've found H4895 very useful. For one, it meters alot better than the IMR stuff like 4895 and 3031. It is also a temp insensitive powder.
I've used it for lighter bullet loads in the .308, and for reduced loads in the .280.
Sure, I like IMR or H4198 for really reduced loads too. It dopesn't make as much noise as the same velocity load with 4895 simply because there is less of it.
As to accuracy, I've found using magnum primers helps. Playing with the powder chgarge, either up or down can also help.
I haven't found any of them to be particularly more accurate than the others if you experiment a bit with them. So it becomes a matter of how much velocity you want. If you only need 2400 plus with a 130 gr. bullet in the '06, I use H4198. But if I need to push a 180 gr. bullet that fast, it's going to be either H4895 or Varget. E