I've got a gentleman finally demo'd/hooked on softer-is-good for his Marlin GuideGun.
(Gobsmacked at a never-seen before 100-yd/1½" 5-shot group w/ his own WilliamsFP-sighted rifle)
.... but he doesn't cast.
Do we have commercial sources for the subject bullet where he can buy them?
(If so, I'll also teach him the joys of mirror-bores w/ALOX)