My title is probably too long, I suck at the forum thing, any ways, I grew up hunting, shooting clay pigeons, and mainly owned bolt actions, got them to group 3 shots at 100 yards in an inch or 1.25..... Called it good, fast forward to now.... Bought my first ar15.... Way different accuracy..... On average with Hornady Frontier 68 grain hpbt, at 100 yards I shoot 1.75 inches..... Sometimes 1 inch, sometimes 2.5, but most groups are between 1 3/8 to 2 inches...... Win. Match 69 grain bthp, I can shoot a couple. 75 groups then turn around and shoot 2 inches but it averages more like 1.375 to 1.25 when factoring in those random 2 in. groups........ Shooting off magpul bipod, with bag in rear that I squeeze for height, gun is Ruger mpr 18inch barrel, 2 stage 4.5 lb trigger..... Vortex offset cantilever mount and vortex crossfire 2 3x9x40..... The scope doesn't adjust when I turn dials then all the sudden it jumps too far...... I dealt with this, today I was playing with hold overs and that caused me to shoot at 25 50 and my usual 100 yard..... 25 was kneeling using mag as a monopod..... Poi was 1.5 to 2 inches low...... 50 yards prone was right on? Should have been low right? Then shot at my zero that was always on (100 yards ) and it was 2 inches high! shot 3... 5 shot groups (I only shoot 5 shot groups now) all were standard 1.75 to 2 inches with same Frontier ammo...... Shot 2 more groups and they are back on the money....... What am I doing wrong? I try not to bug a bunch of people but I have read till I'm blue in the face and there is so much info about parralax, shadow? Cheekweld, shooting off mag, free recoil etc.... All that can apparantly change poi....... I'm ready to pull my hair out lol..... I almost bought a leupold today but thought I'd ask guys who can actually shoot what they think first..... Any help is appreciated, sorry to be so drawn out.