The group opens up too much with a full free float (well, the last time I tried it).
Now, the barrel is pointing just a tad high. So, the barrel band is pulling it down a little bit.

And now that screw 23 is loose (into block 5), the wood should be out of the 'expansion' picture.
Now, I just have to hope the casting itself doesn't bend. It's kinda like a U-channel, so it
should be pretty stable when the sun hits it.
If I'm right, the stock will lengthen in the direction towards the target and the barrel band will
slide along on the outside of the shroud bushing.
Yeah, The way the beats down on a black scope, maybe a little slope in the rear screws would let
it slip-n-slide a bit during expansion.
Haha.. Once when I was tweaking the crosshairs to vertical on the indoor bench (using the hanging fishline)
I forgot to tighten the front screws down firmly. The rifle shot fine. They stayed that way for weeks
and I never noticed.
Cheers,
Rich
Believe nothing, no matter where you read it,
or who said it, no matter if I have said it,
unless it agrees with your own reason and
your own common sense. ~Buddha~