I have a newbie question, on 3 types of match ammo for a 260 rem it is hard to close the bolt and seats the bullet deeper into the brass when It locks. I used a hornady oal gauge and with the 127 gr lrx Barnes bullets I come up with 2.750 to the lands. This seems short to me ? With a new custom gun. Some of the match bullets are 2.798 new and after I close the bolt there are heavy marks on the bullet and the new size is 2.793 and shorter. Is this a problem? Shouldn't I be able to use match bullets from diff manuf?