If you are using Bergers you can call their Tech Support ( 660-460-2802 )and they will give you 6.5 PRC load data.
For the 156gr EOL I have found good results with VV N565.
For the Hammer Hunter 124gr solid, this load was confirmed by Hammer and works well for my setup:
Chamber by GAP with the shorter 0.130” freebore
LPA Short Action
ADG Brass
Fed 210M primer
VV N565: 60.0gr
COAL: 2.90”
AVG 3,150 fps IIRC
This target is from four cold bore shots taken on four consecutive days
In any event, start low, work up, use a chronograph and watch for pressure signs.