I hear you Nick. But I'm never going to get to the point of controlled tests - it's just a matter of dialing in what works for me. Thus far, DT isn't working well with my human/machine system.
Keep in mind, before my original post I also went through some full strength Buffalo Bore ammunition, which made okay groupings for me. Not the best I've ever shot, but my groups had the kind of variability I would expect for shooting full power stuff in a new gun. The DT groups were ridiculously
bad. I just don't shoot like that.
I cleaned and examined my brass after the range today and found something interesting. Here's a picture of two Remington casings (left), two DT casings (center), and two Buffalo Bore casings (right). Forgive the distortion - I was using a wide angle macro lens:
All Remington cases were intact after one firing. All Double Tap casings after one firing had the marks you see in the picture - what could be the beginning of case/head separation or split neck.
Most of the Starline brass used in the Buffalo Bore loads was good to go even after having been reloaded and fired twice... except one Buffalo Bore casing which actually did separate after the reload was fired:
So in terms of reload-abliity, DT isn't scoring well for me so far either. I will not re-use that brass.