I have the remington 700 sps tactical in 223, and the fcp-k in 308. they are both great, but the fcp-k gets the nod for a better stock. As far as accuracy, about equal. Both await a better shooter than me to reveal their full potential, but I find the under 1" groups I do get with either at 100M gratifying.
The sps tactical is much handier, with a 20" barrel. The hogue stock is a bit 'flexy', and not great on a bipod. I found it too 'grippy' (almost sticky) and treated it with armor all to reduce the stickiness (which worked). I am considering restocking to something stiffer. It shoots much better with 68 gr projectiles than the 55 gr for me. I have not tried anything really light, like 40 gr yet. It is much lighter than the fcp-k, but on the bench you don't notice.
The fcp-k is bipod ready, which is nice, and the accu-stock - accu-trigger combo is great. I like the detachable mag too, but that's just me. 165-168 gr seems to perform the best, but the difference in performance between bullet weights is not as pronounced as it is in the remington in 223. The brake is effective, but when I shoot it I am glad I am behind it, not beside it.
For pure target shooting I do prefer the 308. The brake on the fcp-k, combined with the weight of the gun, makes recoil pretty tame. When hand loading, the larger selection of bullets is great, and the larger case allows more precision in powder charges. Yes, it costs more, but for target shooting it is not that many rounds in a range trip for me and I can suck it up. There is also a much greater variety of factory ammo to play with in 308, including some truly great off the shelf match ammo. In the case of the 223, not so much ammo variety and availability of different types is spotty, at least where I live. For the 223 I have not found a truly great off the shelf round yet, but it does well with hand loads.