Took the newly built 6.5-284 to the farm today to test some handloads and break the barrel in. I think I have a keeper. May try and stretch it out to 600 tomorrow

Lapua Brass
140 grain Hornady SST
48.5 grains of IMR4831
barrel head spaced on my resized brass

measured less than .30 by my calculations. Although I think it's smaller than that.