Re: 300 RUM laod w/H1000???
Glad you asked. I have a 300 RUM as well and my powder of choice for it is H-1000. It was the first powder I tried, and I never have had to look back as far as accuracy or velocity. My rifle gave great groups at 92g for a high node of 3150fps, and also shot great at 88g which is good for 3000fps. They were in Rem brass, Fed 215 primer, OAL was 3.660". It is a .5 moa load out to 800 yards. Hope it works out for you.