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One other interesting note, not sure if I mentioned earlier but it seemed like the hotter the barrel got the smaller the groups got. Really odd!
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Maybe odd ... maybe not. IMHO, There are a lot of things that will take a rifle from 2 moa groups to sub-moa groups, but I think that once it gets THERE, barrel harmonics have a LOT to do with the improvements to get to .5 moa ... I don't yet have any rifles that shoot better than .5 moa so I am unwilling to say that you don't need to get exotic to get that kind of performance.
Back on topic ... When your barrel changes temperature, its resonant frequency will change and there's probably a 50-50 chance that it will change in your favor ... see Browning's explanation of their BOSS system (you might have to actually look up their patent ... # RE35,381 which is a reissue of #05279200 ... for the really good explanation, I forget where I read it) ... even if you don't want to use a barrel tuner, the info is quite enlightening ... and it explains why most rifles shoot best at a particular velocity ... and it is not necessarily the MAX velocity for a given cartridge
Best,
Saands