This will be my first rifle in 308 and I just want to get as much insight as possible. I only own one AR 15 and it's a 16" Bushmaster XM15 free floated and Geissele trigger. With a 1-4x scope using 55g Winchester white box I can group moa or better at 100 or 200 yds. If I go with a 16" in 308...