The brother-in-law and I went to his range and was doing some 400yd shooting with a handful of rifles. At the end I plopped him down to shoot my AR with 50 grain Vmax (to me Zmax and Vmax shoot the same) and he shot a 1-1/8" group of 3 at 400yds. I had 2 under an inch but had a flyer that pushed it to 3". I didn't weigh cases as these were random out of a box of 100 made up. I thought I had my 40 grainers which trade off on which batch is more accurate but found out it was a box of all shot cases I forgot to pull out of my range box so no shooting them. I did put a couple of my 58 grain .243 just over an inch at 400yds, my rock chuck gun.