Interesting, Big Al. That makes sense for the 223. As for the 12 gauge, the Hornady is 300 grain, which is the lightest I know of. Unless the diameter is abnormally small compared to other sabot slugs (I don't THINK so, but I'm not sure), then it is probably a shorter projectile and therefore doesn't need a fast twist. Probably true, since it performed so well in this barrel.
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