[IllinoisCoyoteHunter]

I think 9mm is "hard" to cast for because most of the available molds for 9mm are alot of the time not big enough (as in diameter). My Sig 9mm slugs at .3565". If I were to buy a 9mm mold at .356" I would have a leading nightmare.

The high pressures also have a lot to do with the trickiness.

For 9mm, it is IMPERATIVE to slug your bore, as you should do with any other firearms you intend to shoot cast from. Also, go at least .001" over your groove diameter. I go .0015 over. Myt 9mm boolits are sized at .358" Good quality lube is important too. I prefer Carnuba Red. And lastly, your alloy must not be too hard. Harder is not always better. I use air cooled wheelweights.

Good luck!