Dennis,

No correct answer...

Some bullets like to be jumped, some shoot best into the lands.
I would load 5 bullets at the following lengths

2.837, 2.852, 2.867 and see what works best. And then load to that COAL.
You also need to keep in mind that bullets touching the lands or jammed into them, tend to have higher pressures than those being jumped.
Working up a load is frustrating, but rewardng when it works.