Irons should be good to 600yrds. Going to try my usual handloads 43grn Vit 140 Lapua 155's, also Men nato and RG nato, see if I have extraction problems. I find privi useful but not brilliant, and the powder they use is very dirty and takes ages to clean out.
Irons no good at 600 when your eyesight is as bad as mine
PRVI are cheap and cheerful, but they will do me to get set up then move to something a bit classier