Hello all so I have a 8.5in 1-7 twist ar in 300bo and am starting to do some subsonic loads I found a nice price on some berrys 220gr bullets and ordered some. I have lil gun and 1680 powder and am using cci 450 primers with LC 223 to 300bo brass. Was wondering what you guys were using to load these 220gr bullets for starting loads and recommended loads for it. I know hodgdon recommends max load of 8.4gr of powder but what do you guys think/use thanks for the help!