Re: 45.5 Gn's varget+168's=too hot for my ar10?
That might be pushing it. In my gun I haven't tried 168s, but I have tried:
175gr SMK: 45gr was too hot, serious ejector swipes on every piece of brass. 44.2 is what I'd call max. 2580fps
155gr Scenar: 46.5 had swipes on 8/10 pieces of brass, settled on 46gr as a safe load. There are still some shiny spots where the ejector is on some pieces, but lots of factory ammo does this also. 46.2 is about the same but I stay at 46 to be safe. 2750fps.
This was with virgin Winchester brass.
Gas guns really are limited when it comes to max loads.