the Manufactures that I have, Glock, CZ, Beretta, Ruger, SIG, most all do not recommend steel case. If you ask anyone IPSC shoot he would not recommend steel. I you only shoot 100 to 200 rounds a years it's not big deal, but when your shooting 1000 to 5000 in a year it does.
Reliable gun, Italian sporting goods and International shooting supplies all had recent sales where 9mm were at $200-$220 per 1000rnd case of brass and/or aluminum.Canada Ammo 9mm Blaser $299/1000 works out to 30 cents a round, cheaper then LCW which is $175/500
I just ordered from TulAmmo, 9mm 1000 for $219.00