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I built a 223 WSSM using a Pac-Nor barrel as a long range varminter, and I have not seen the fouling issue. As a matter of fact, it's not any worse than my 6PPC. This is with very slow burning powders such as RL22, Magnum, 7828 at 55,000 PSI level pressures. Of course, Wipe-out is my best bud, and I don't run more than about 30 rounds between cleanings. Everthing is shot "slow fire" too.
The brass on these cases is VERY thick, which makes resizing a little different. Lot's of spring-back, and you need pressure or you will soot the outside of the cases.
I've shot about 500 rounds through mine, and can't really detect any throat erosion, yet (three groove might help with that).
The round is accurate (mine stays .5 MOA, which is the limit of my ability), and it is very useful with 75 gr. amaxes at 400 to 600 yards. The varmints seem to be rather impressed. FWIW, Dutch.
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