Win748 is a fine powder, but for long range I would change to Power Pro 2000-MR and a 175gr Nosler Custom Comp bullet if you want to keep using your progressive press.
I've been using Power Pro in my 223 loads for service rifle under 75gr HPBT and 80gr AMAX bullets. The burn rate has been called, "Reloader 15 but in ball powder form."
If you want to use a stick powder, get a Lee Perfect Powder measure and buy the adapter to use on a powder through die. You will get better than +/- .4 grains. And honestly with 4064, a .2 gr spread isn't anything under a 168 or 175 hpbt bullet unless you are at max.
Machine guns are awesome until you have to carry one.