I've handled one, but didn't shoot it. It is.... Jeff Cooper scout rifle logic, believe it or not ) It is very handy, very light, stock is very solid but it folds, but very solid. It aims as an AR and it shoulders as an AR. Trigger is decent, even nice. But it is not Trigger tech diamond or anything like that. Bolt is smooth, but not custom action smooth. Overall - you won't shoot it long range, you won't even shoot it medium range better than most traditional bolts, it looks like you won't enjoy shooting it prone - too light, too AR-shish. But it is a scout rifle - very light, very handy, close range snapshots off hand should be very enjoyable. This is 300 meters rifle, so 308 or 6.5 won't make a difference. It is all about light, handy, 4-5 inches group at 300m is plenty.
I find that my 6.5 CM Cross is considerably more first-round accurate than my conventional, dedicated hunting rifles at medium and long range, so I suppose I beg to differ somewhat with your prediction of Cross performance vis-a-vis conventional bolt-action designs. Of course, that depends somewhat on your definitions of "medium range" and "long range", but out to 900m (so far) my Cross is the equal of my Hardy barrelled Christensen Modern Precision Rifle, or my Cadex .308 Guardian Chassis rig. It rings steel at all ranges out to 900m with equal ease, and is capable of performing as a "precision rifle" out to at least that distance in a pinch. I lose approximately 150 FPS from factory match loads out of the shorter 6.5 CM Barrel on the Cross, however that is the rifle's only limiting characteristic - the price you pay for that light weight and easy portability/stowability.
Aspirations of "precision" notwithstanding, the Cross is equally suitable and capable as a hunting rifle. Hence the "Cross" as is "Cross-Over" name. As a hunting rig it excells by just about every conceivable measure. In terms of accuracy alone, the Cross is capable of far better than 4-5" at 300m if fired from a rest with time for fine aiming. It inherent accuracy at 300m is more like 3" in my personal experience. But that's admittedly with match ammo, on the range, under perfect conditions. In the field, the Cross will easily deliver the accuracy demanded of a hunting rifle, with the added advantages of light weight, short length (even shorter with the stock folded), and user-adjustable Length of Pull, Butt Plate Height and Eye Alignment. No conventional hunting rifle can match all of those attributes, particularly the adjustability.
Given the above, I would contend that the SIG Cross is a revolutionary product that spans the full spectrum of what a rifle should and can be capable of doing. It is more than just a Cooper-esque "Scout Rifle" lacking a forward-mounted Low-Power Variable Optic. It is a cross-over rifle equally at home on the scored rifle range and afield for hunting or personal protection. Not necessarily the first of its breed - that distinction properly goes to Christensen Arms and their Modern Precision Rifle, however SIG is the first to take it big-time, and the first to come up with the integrated Action and Chassis. It is a pretty unique offering at present....
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