I have had good luck with Rutumbo in my 300 RUM. I also use H1000, and depending on the weight of bullet, I pretty much am happy with those 2.
Velocities are consistant at mid loads. Haven't played with it much at heavy loads. Gives good velocities. Not the fastest, but top 5 usually.
2 thumbs up for Retumbo here.
Wish I could get some H870....