OK, I'm satisfied with this load.  I don't see any good reason to find the max.  New BCC cases sized to the rifle, 5.7gr 10B101 (high nitro flake powder made by Vihtavuori, used in 50BMG plastic training ammo, burns about Blue Dot speed) 46.5gr of WC860, CCI#34 primer.  Primer edges rounded, no difficult bolt uplift or sticky extraction.  The necks on all sealed.  I need to get a scope on this rifle and shoot it against the AR boys at an upcoming Ohio Rifle and Pistol Association match!  Next project will be doing something similar with the .310" 174gr FMJBTs and the larger bored 92/96.  I've been packing these 150gr Hornady FMJBT bullets since the late 80s, about time they found their way into a backstop!  Here's a shot of the muzzle after a bit over 20rds.  I've no idea how fast the bullet is going, don't care.  Once I found the new zero, clay pigeons at 100yd were pretty easy.  Thanks VA, I'm getting used to these glasses!

---