Thread: what causes differences in OAL with a comparator ?

Eg. kist loaded up 83 rounds of 7mm saum, all brass was resaized the same, annealed etc. loaded to 57.86mm with the 7mm comparator, and half of them went between 57.78 and 57.9 mm, the other half were bang on.

what would cause this ? Seems to happen with whatever cartridge im reloading. could it be my hornady calipers ? Additionally, if you were aiming for 57.86mm, what tolerance would you call safe ? I can hit a tartet at 460 with this, 2 rounds less that 13mm apart centre to centre.