I don't think I'd be too worried just yet. You shot 3 different kinds of factory ammo in two different weights and these were the first 30 or so rounds fired. Lots of barrels take about 100 rounds before their speed starts to stabalize which impacts harmonics. I would probably shoot some more rounds before making an accuracy judgement. Target #6 a good 3 shot group may be as much of a fluke as your biggest group at this stage. If you are concerned about bedding after you get further along in break in you can test it using one of the tried and true methods of measuring the forend movement you could also experiment with a few groups shot with and without your box for comparison.