I never thought I had trouble with the 358429, cast and shot thousands with an old single cavity Lyman. Until I started shooting longer range regularly. I started a thread here a while back about it, they shoot fine until I stretch it out to 75 yards or more. Then I get really erratic flyers, like 2’ off in any direction flyers. I haven’t really tried to sort it out yet, I’ve been busy and it’s been hot. But I did buy a 38-150KT RCBS mold as one possible solution. I’ll start casting more this fall when it cools down a little and maybe get to the bottom of it, or maybe just go with the RCBS.
Never had any luck with the 358429 in either of my Blackhawks. I've tried crimping over the driving band as the cylinders are too short for a "full length" 357. I tried trimming .10" off 357 brass, and using 38 Special brass. Tried H110, 4227, Unique and 2400... Nothing consistent.
Switched to the RCBS 38-150-KT, and never looked back.
