Wouldn't you know it. I found a great load for my 300WM using H1000 powder and it was my last loading on hand of that powder. H1000 seems to be in short supply right now so sometimes you have to make other choices. As in fishing- "the best time to fish is when you have time to fish". I have some IMR 7828SSC and IMR 7977 in my shop unopened. These both have load data for 300WM. Does anyone have experience with either of these in comparison to H1000? Any input appreciated.