The precision and point of impact of every firearm I am aware of will change based on how far the bullet sits to the lands. As you all are probably aware, this cartridge head spaces on the mouth - but if you are building a cartridge to a specific case overall length (COL) and your cases aren't the same size, your bullets are going to be a different distance from your lands when the move into battery. I have noted a vast difference in case length based on the measurements I have been doing with Scharch (top) brass. The short sample I took was that the cases measured from 0.982" to 0.992" with an average of .988". I believe this is going to create an impact on precision - even if the velocity turns a low s.d. through the chrono. I do get a round that is off P.O.I. sometimes when everything "felt" right - I am wondering if it a variance in case lengths could set it off enough... I noted that in one reloading manual it showed the trim-to length @ .982" with a max length of .992", yet wikipedia suggests .992" as the length of the cartridge and earlier I purchased a LEE trim guide that seems to measure .992". Can I get some of you all to measure some of your formed cases (please state the brand) to get a comparison? Do you sort cases for length to make precision loads to ensure the bullet is in the sweet spot - or is the .01" variance not worth messing with?