Can you please post what barrel length and velocity you are getting with your .300 Win Mag's and 210gr Berger's or Match kings. Also if you are running max pressure, Mild pressure or inbetween. Iam trying to find the best compromise between velocity and portability.
210 Berger from a 28" Broughton 5C with H-1000 and a Fed GM215M 2995 FPS I see no pressure at all using Lapua brass and have been a few grains higher but the accuracy and low ES was here.
My sons 28" Broughton 5C with a bit lighter load and all the same compoenents is at 2916 fps. Have not tried a stiffer load in this rifle because it too shoots bug holes. But still never a sign of pressure.