Finally broke my on-hand DT barrels in. It was all with retail ammo and all with out of the box barrels that hadn't been shot at all yet.
Below is the .223rem target. There's 4 shots in there where I'm getting a zero that are pretty obvious. Those are where I was getting the zero dialed. Once I got a decent workable zero I ran one shot at the bottom red dot and then 5 shots at the center bull and then one shot at each of the red bulls on the periphery starting at bottom and working around clockwise. Then I cycled back to the center bull for 5 more shots and then back around starting from the bottom 3 times. So, the center bull has 20 shots in it and the perimeter red dots all have 3 (except the bottom one which has 4) because that's when I ran out of ammo. It's running well under minute of angle with bought ammo. Kudos to SAC on the .223 conversion. It's pretty pimp. 75gr Hornady Black at $1.70 a shot.
Then I broke out the 300wm. It kicked pretty aggressively which I'm not super used to so after dumping a mag at dirt clods to get a reasonably workable zero I fired this set of groups clicking turrets up and over to keep me on fresh material and then I was done with heavy recoil and let some range neighbors who were scared of big rifles finish the box. They were impressed but no longer scared after dancing with the 300wm. What's really amazing to me is that all of those holes are actually 3-shot groups. I was/am stunned. Terminal Ascent ammo @$5 a shot.
Then I broke out the 6XC and ran some Tubb ammo through it. 3 rounds to get a reasonable zero and then a rapid fire group. It'll do. Windage is on me. I shouldn't have used my aim point as an impact point and I was slapping the trigger a bit and flicking the booger coming off the trigger right as each shot broke. David Tubb's coated 115gr Ammo @ $2 a shot.
I was able to get a good base zero which is pretty much the 6XC dope and then I can adjust/hold for the difference for 223rem and 300wm which (strangely) exactly share their zeros. So far all of the barrels shoot to the a consistent POA after barrel swapping or pulling off the scope and reattaching it.
Damned accurate rifles especially considering I just picked whatever ammo I could get from Midway. Gotta get this chubby to relax now.