What causes the flier? I am shooting a 338 ultra mag. 30" lilja barrel with a 12 twist. I have a pretty good load worked up. 250 match kings 90grain 7828 215 primers and .005 off the lands. Every one on here uses the moa for their groups, I always measure the widest point and subtract one bullet dia. Anyhow, for example; the other day I shot a 5 shot group that was a .193. It shoots great but it took me 6 shots to get that group because i had a flier. It dropped shot #4 1/2". What causes a flier? I am confident in my gun and confident in myself but if the round i fire at a deer at 600 yards is the one that would shoot 1/2" low at 100 yards, i'd miss the deer.