I'm building my first AR-15 right now, it's basically a vanilla M4 with a 1:7 or 1:8 16" barrel. In addition to shooting j-word reloads for longer ranges, which I can do for about $0.20/round, I'd like to be able to make plinking rounds from lead for shooting at 100 yards and closer, because I can do those for like $0.13/round.
I'm aware that I want to aim for an FPS of around 1800 or so since I'm using water-dropped COWW alloy. Ideally a 6-cavity mold would be cool since I'd like to be able to quickly pump out a lot of plinking boolits. But the only .224 6-cavity mold I'm finding is a round nose flat point by Lee. I've heard rumors that one tends to have feeding errors.
Would I be better served with a different mold to avoid feeding errors? I also think maybe it makes sense to go for something a little heavier than 55 grains since my twist is going to be pretty fast.
Mold recommendations and all other wisdom welcome. Thanks in advance!