This past weekend we measured the bullet to rifle barrel lands engagement and adjusted the bullet seating depth. We adjusted my 300 RUM standard RCBS bullet seating die for 0.003" off the lands. What we are seeing with loaded rounds now are variances of +/- .002". I am using a RCBS Rockchucker press. The bullets are Hornady 208gr A-Max's. Is +/- .002" all the better I will get with this press/bullet seating combo? The press seems to be pretty tight.