I shoot the Hornady .224 75 gr MHP's out of my AR. I can see quite a bit of variation in the tips from lot-to-lot, but overall, they shoot the lights out for me (0.25 - 0.75 MOA).
I tried a box of 180 gr SST's in 30 cal through the Tikka M595 (.308). I ended up using all 100 of the bullets in load work up, trying to find a load that would shoot under one moa. Most loads with the SST's averaged between 1 and 2 moa, where loads with other bullets would average around 0.4 - 0.7 moa. I tried something different, primers (CCI) and powder (Varget), with the last 5 bullets in the box. Those last 5 bullets went into a group just over 1/2 moa. I didn't think it was worth the $ to buy another box just to see if the last group was a fluke.
I inherited a few boxes of old Hornady 30 cal 180 gr Interlocks (flat base). I figured I'd use them for practice shooting off hand with the Tikka M595, but shot a few groups just for kicks. I was surprised to see sub one inch groups right out of the gate, without any work-up, and sub 1/2 moa after some load work-up.
I picked up a bunch of old, flat base, 200 gr Hornady Interlocks in 338 cal at a gun show (they were less that $0.10 per bullet). I figured I'd use them for fouling shots, off hand practice, and as varmint bullets. I shoot them out of my GAP/Sako 338 LM. They group anywhere from the low 2's to 0.7 moa for me and at 3300+ fps, they make for great varmint bullets.
That's my experience with Hornady's...