So you're going back for another range trip tomorrow then, right?No, I've only used it with the rear anchor allowing the rear to be bolted to the stock as in most Bolt actions.
I think this is where I screwed up. I hadn't cleaned the barrel breach face and bolt face as thoroughly as I thought. I'm guessing there was a couple of thousands build up and the increase in headspace might better explain the inconsistency I was observing...or at least that's my best guess.