Given the VV choices and calibers, my thinking would probably be N150 or 550 for 308 and 375. I'd lean toward N140 or 540 for the 404. While N140 or 540 may yield the top accuracy in the 308... I'm still thinking high temp/high pressure and hunting applications so would lean toward slightly slower powder like N150 or 550 for both the 308 and 375 especially in the heavier bullet weights. Just 2 cents worth