First: a T3 is a T3. It doesn’t really matter which particular flavour you get - the barrels and actions are all the same. So why restrict yourself to the A1, which limits your calibre options.
I’d instead start with the calibre choice, get whichever t3 comes in that calibre, then customise it. That’s the beauty of T3s - they are endlessly customisable.
6.5 isn’t really a hare shooting calibre. I have done it, quite a lot, out to about 300m. It works, but it seems like absurdly unnecessary overkill, and the trajectory is quite unforgiving at longer range.
I would get a hot .22 centrefire for the specific application you mention: .22-250, .22BR, .22ARC, .22 Creedmoor. I got a .22ARC in part for precisely this: shooting hares at longer ranges. It is perfect for the job.
Why is it overkill for you? genuine question. I havent tried the 6.5 creedmoor but my 30-06 Works fine on hare for instance. Bigger hole sure but no real difference in effect on the edible meat, not like iam eating the head.
Thing is i want THAT chassis. I really like it. And i feel like il pay alot more getting a super varmint in 22-250 and buying a MDT chassis for instance. On another note entirely, how many shots can you even get from a barrel when shooting 22-250 with an 1:8 twist? seems like that combo would wreck barrel life unless pressure is neutered.

