It's a BHW Barrel and I added that information in the original post.
I did some case comparisons (water weight in grains) and decided to start a grain below (just to be safe) the top 6 PPC load data and slowly working my way up until I get to 3400-3500 and/or see some type of pressure signs (primer flatting/cratering, swipes, burrs, etc.) with the 58 V-Max, H322 and BR4, Fed 205 and CCI 450 primers. The bullet touches the lands @ 2.245" so will start with a 2.230" C.O.L.
Case Length: Min 1.676" Max 1.686" (Target trim 1.680" + or - .001").
Note: I have about 400 pieces of once fired Hornady 6.8 SPC Brass that was annealed and sized to 6x6.8 SPC in a single step using the CH4D die.
Disclaimer: Any data posted is meant as information ONLY; may not work and be unsafe in your rifle/barrel. Therefore, if you decide to use the information provided, then you are doing so at your own risk.
Here's the 6x6.8 SPC with TI Can, Texas Predator Posse Edition Lower with Timney 3lbs trigger and Thermion XP 50 Pro 2-16 Thermal
Waiting on the adjustable gas block and Acra rail but thought I would post how the build is coming.