Re: ogive measurment
How to use it? The purpose is to duplicate the seating depth established in the load workups at a later date. You can make a dummy round to reference or remember to save a couple of loaded rounds from last loading session to compare seating depth of the new loads.
Attach the comparator on the fixed jaw of the caliper or if you use the nut place it against the fixed jaw. Then push the bullet into the comparator hole and bring up the movable jaw till the it makes contact with the base of the case. Do some minor wiggling of the case to get as accurate a measurement as possible. I think you will catch on easily. Then it is a matter of adjusting the seating die to seat bullets in the next batch of cartridges to duplicate seating depth.
It will take a few adjustments even with a micrometer topped seating die. If you make several small adjustments with the same cartridge moving towards the correct length, be sure to try some other cases with your usual seating procedure to verify you have duplicated the original seating depth.
If you have more questions just ask