So far this model 24 has not taken a shine to keith type bullets. The original Keith bullets are a pain to cast(I do'nt buy bullets anymore) because of the square bottom lube groove. Works fine when shooting but they are a bit harder to get to drop out of the mould. It's still a work in progress and I've been using a Lyman 429421 keith mould but I am going to order a custom 250 gr mould from Accurate Molds. The man who makes them does some of the most beautifull work You ever saw on a bullet mould. I've never tried HS-6, but a lot of people love it. I have 5lbs of Unique and of the 12 44's I've owned, I never had one that would'nt at least tolerate it or 2400. When I hit the right load, it usually is the bullet and/or the pressure that makes the diff.
Murf205