reloading help

Hello, I’m reloading for my 300prc, laupa brass, GM215M primers, Barnes LRX 208gr and H1000 powder. I’m getting great groups (under half inch 5 shot groups) for the most part some around 3/4 of an inch but all well under MOA. I’ve always looked for SD under 10 but I’m getting 15-17 fps for SD...