Thread: 284 seating depth query

Originally Posted by zimmer

You still need to take a guess on jump to be added to the dummy cartridge length and advise your smith.

Don't forget this bit.
Without any further instruction it's odd-on that Gunworks would cut the freebore to have your dummy rounds just touching the rifling. If you then decide to experiment with some jump during load development - and anecdotally most shooters are jumping the 162 ELD-m - then the shank-boattail junction will move from level with the case-shoulder junction back into the case by the same amount.