Yes.
What you’re missing is that you can also make your own tooling.
Get some O-1 drill rod, and start from there. Learn how to heat treat and temper steel, and you’ll have to worry about your final dimensions once. After that, you just keep using the forming tools.
I could, in theory, turn a chamber for a rifle on a lathe with a boring bar. But that takes too long, so we use reamers that are sized for the chamber in question.
Custom made tooling is the cat’s ass. That’s why I have a collection of O-1, A-2 and S-7 drill rod next to my machines. Need a screwdriver, punch, chisel, cutter, drill bit, countersink, whatever? I make it, then heat treat, temper, put a little grind on it and wha-la. I’m off to the races.
Seriously, check it out. Saves you GOBS of time...
Not missing that at all. I've made my own tooling before, but it usually isn't worth the effort when only making a few parts.
. Learn how to heat treat and temper steel, and you’ll have to worry about your final dimensions once.
I know quite a bit about this. I usually make my custom cutting tools out of T-15. Lasts longer than O-1. I'd worry about deflection and distortion when machining out brass that is this thin, and of course it's not anywhere near cost effective as just buying ready made. Those poor suckers who have firearms with obsolete cartriges are kind of over the barrel if they want ammo aren't they?