Slow twist rate. Most of the 22-250s (ditto 222 Rem) on the market have 1-14 twist. Varmiters like their "photon torpedo" loads, and you can put more of them though a 1-14" twist with less fouling problems. Put the same photon topedo loads through a 1-9" 223, and the ratio of shooting to barrel cleaning goes south.
Tom
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