I am gathering up parts and supplies for an upcoming rifle build. Planning to make a Southern styled rifle, but I am using a Rice transistional 38" swamped barrel. So, It will be a bit shorter and possibly thicker than most rifles of its type. I can't decide if I should go with a 5/16 ramrod groove and ramrod or go up to a 3/8". This is on a 40 cal. I am making it for myself so I don't have to please anyone but me. Anybody have any thoughts for me? Thanks