you shouldnt really even need a comparitor for accuracy because the seating stem in the die seats them off the ogive anyway, resulting in the same jump to the lands. i like to loosen a collet die and partially size the neck just enough that the bullet can be started by hand with moderate pressure and then chamber it in the gun. the bolt will seat the bullet so you measure and record that OAL, remove and use that very same bullet to seat in your first charged case but seat it .010 less than the recorded OAL for a rather short jump to the lands. keep the seating die locked down and load them all. the OAL's may measure slightly differently but the base to ogive should be the same.
more important than comparing lengths is weighing bullets but thats another topic altogether...
more important than comparing lengths is weighing bullets but thats another topic altogether...
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