Problem with the SP x39mm rounds is that the SKS has no feed ramp, just a little ledge the projectile hits to point it into the chamber. When the SP hits this ledge it gouges the shit out of it, sometimes enough that the round ends up pointed vertical hanging half out of the chamber with the case dented by the bolt. There is talk of carefully taking the very edge off this ledge (like .25mm chamfer), but if you go too far you're in deep shit as the round won't make it into the chamber at all. Bascially, the SKS wasn't designed with SP rounds in mind.
Have been meaning to try HP rounds, might be a bit better as the point is sharper. If anyone has, let me know.
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