I can get the 140's to 3600 fairly easily, I have no doubt with 120's I would be able to get it to 3800-3850 fairly easy
Hopefully we will get to see what the log pole I got from you will doImr 7828 long cut and R#22 with fed 215s both produced incredible velocity and groups with the 120s, about the size of a pencil eraser. 120g Barnes Tsx and TTSX also shot the same loads jumping .050 from the lands. Best accuracy is right on the ragged edge of max pressure. Don't expect to get a lot of firings out of Rem brass. Our barrels are 25.5", which started life as new Rem 7 Mag barrels in SS sendero's.