I have a new 300 PRC custom rifle with a 24in proof barrel 1:9 twist that I am looking to reload the 199 HH. I have read the spreadsheet on hammer bullets loads with some guidance. I have some RL 26, H1k, Retumbo and some N568. I was hoping to use the H1k with this caliber. Does anybody have any good load data including speeds with any of the previously mentioned powders above that aren't listed on the hammer hunter forum spreadsheet? Thanks in advance.