It actually uses a .228 bullet, and mine is ridicously unaccurate with "proper" bullets. With heavier (63 and 71 grainer) .224 sierras, I get much better accuracy. Sample of 1, but that's how it is.
I think the 5.6X52R used in Europe has a faster twist rate, maybe even the OPs suggested 1:7 or 1:8.
