Group Buy Lilja Reloading Document

[Tedward]

Just started on my first reloads

Lilja - 319 barrel 1/8 twist


bullets-- Hornady 123SST

Coal 1.518 +/- .002
OAL 123SST -- 2.27/-.005
OAL 123 CC -- 2.26 /-.005

Jump - .01-.015

How can the jump be so little if the COAL to the lands is like mine and Corys measurements which is around 1.768 to 1.765? That seems to me it would be .248 jump unless I'm just not getting this....
Just looking for explanation to learn.