I just got my 300 win mag from centershot rifles. Looking to push a 200 accubond. I have h1000, retumbo and h4831sc. Norma brass and fed match primers. Pulled data off Hodgdon's site but everyone seems to be well past their max. My nosler reloading book doesn't have any data for H1000 or retumbo either. I am looking for good data on what folks are using on their 300 win mag that is 1/2 MOA or better please. Thanks for he help!