Doing some reloading of 257 weatherby for a friend going to be using H870 and H1000 was wondering if anyone has tried these powders in a 25/06. They both meter so well would be nice to use them for load development.

McD,

I would not use either in a 25/06, H4831SC is probably as slow as you would ever need to go, maybe in a 25/06 improved you could use the 870 but H1000 hmmm unlikely.