I haven't shot the Kynoch ammo but I've heard it's slower than Hornady. Right? I'd try about 90 grns of IMR 4831 for a starter. My Sauer shotgun conversion and the Searcy seem to like 96 grns with 500's.
That has some nice figure in nthe stock. So what sort of a critter is supposed to be on that top lever? Wolf? Dog? I haven't been able to tell from any pictures. The lazer engraving looks pretty nice from the pictures also!
Congratulations on that rifle!