The following's a good article on 7.62 NATO match ammo:
http://riflemansjournal.blogspot.com...nge-match.html
'Twas either Whelen or Hatcher that tried IMR4064 in .30-06 arsenal match ammo some decades ago. Weighed charges of it shot more accurate than weighed ones of IMR4895. But the high speed metering couldn't keep charge weight spread low enough, so the arsenals stayed with 4895.