I have three or four 429421 molds, round and square lube grooves. The nose on all four is different. I would have to look but one is a maker other than Lyman I am pretty sure.
I have one that is a single cavity and I have been told it is the original design.
The nose and front driving band are different than the other three. Buddy had picked it up some place, cast a few and decided a SC mold was to slow and did not perform well in his FA. I grabbed it and ran. I cast a fair pile and tried them in my Ruger. It liked them, so I loaded up a hundred. Dunno what I did different but his FA really liked them. Fast forward, I picked up my own FA and tried them. No go. More of a pattern than a group.
Taste tested. Some with a round lube groove and I was in business.
Odd how the likes and dislikes are among wheel guns.
Jeff