Hey there, I have owned an M1a1 SOCOM,, and now in the market for an AR variation .308. I'm thinking the Rockriver arms operator, or Bushmaster ORC carbine. I reload, using the 168 gr sierra HPBT and varget powder, which I have used for my SOCOM, is there any changes in reloading data that I need to take into consideration, going to an AR .308?