I am sending a rifle in to pacnor to have a new 223AI barrel put on. It is going to be a 1-12T barrel as I want to shoot light bullets 40-55 gr bullets with the possibility of a borderline 60 gr. My problem with my current 223 AI barrel is it was throated wrong, 1-12t with a throat for seating 80 or so grain bullets. Its currently a .158 jump for a 55 gr vmax bullet! I am trying to figure out if I want a sammi throat length(I think is 1.88) or a shorter length. The dummy rounds I have worked up place my 40 gr vmax at a COAL of 2.235 and base to ogive 1.840. This also works for the 55 gr vmax and 53 gr vmax but the latter two would be seated a bit deep into the case. Would this deep seating cause any problems? or could someone recommend a good seating depth? I hope this rambling mess makes sense! Thanks.