I've got a ? for the experienced vld hp loader. Is it critical for accuracy to have all your loaded rounds at the same oal or is it good enough to seat them usoing the same setting on my bullet seater. I'm loading 6mm 107gr SMK w/ a Redding competition micrometer seater and I'm getting oal variations of .020 or more from different bullets in the same box. I 've seen in Sinclair a bullet comparator that looks like a big hex nut w/ holes in it. I guess you insert the loaded round in it and measure from the top of the nut to the case base. Is this measurement more important for accuracy that oal? As always I appreciate the knowledge from thoses of you that have been there and done that.