Troy,
Maybe he can.
However, since he's in the Czech Republic, I'm assuming that he's shooting under IMSSU rules which are not exactly the same as ours. (Unless they've redone their rules, they require that a hunter rifle meet the old criterion of matching the factory output; also, AFAIK Sako never chambered .260 or used a taper that matched that of Douglas. And he did say he has a silhouette stock.)
IMSSU has a pretty good website and, unlike us, they publish their rules. (I looked.) Now, if they haven't updated... ?
Of course, I've been wrong many, many times before so, if I'm off base again, it won't surprise anyone -- and I know what happens when I 'assume' things!