The Tac A1 is indeed a gorgeous beast, but as others have said, it'll be a brute to carry. A friend of mine has one and he takes it occasionally but trust me he is a big strong lad. It spends more time on the range. It is far more of a a target rifle and there won't be many folk who could be comfortable with it as a sporting rifle. There is, in my humble opinion , a compromise option, two in fact, and those are the T3X Supervarmint and the T3X CTR. Both available in .308 and 6.5 CM, and not much to choose between them in price or weight. The TCR also has a couple of barrel options, 20" and 22". Both have the same superb stock, with grip scales on the supervarmint, but otherwise identical. The shorter CTRs come with a straight stock, and the longer ones have the adjustable cheekpiece. The supervarmint has a heavy varmint barrel, the CTR a semi-varmint barrel. The supervarmint has a standard 3 round flush magazine and standard T3 bolt, the CTR has a metal 10 round mag and a teflon coated bolt.
I had the two to choose from a month ago and chose the CTR. I was lucky enough to be around when my RFD had a special order version of the CTR, a 20" barrel with adjustable stock. I'm very pleased with it and put in some good groups on the zeroing range. I carried it on a 4 hour hill stalk, and can confirm the only drawback is the magazine which digs in if you've got your sling wrong. A couple of woodland stalks and a session in a high seat showed that it is perfectly good to carry, but again, the caveat is that I'm reasonably strong and fit, so the extra weight over a lightweight stalking rifle didn't limit me too much.
The Creedmoor rounds are dear at retail price in comparison with factory .308. Hornady ELD-X were £56 for 20, whereas I can load my .308 with nice Federal Powershoks for half of that. American Gunner ELDs were £78 for 50 RP so a bit better on the range, but I reload anyway, and get a healthy discount on components, so factory round costs are sort of irrelevant.