Brass case 556 is expensive, russian 223/556 steel case somewhat less so. I'd like to shoot the cheap stuff, and I see this in the course description:

You may shoot reloaded ammo (at your own risk) or steel case. You MAY NOT shoot any steel penetrating core, i.e. NATO green tip.

Some ranges, though, hold a magnet to the bullet and exclude any that sticks. Bimetal bullets (which I think most wolf, tulammo, etc use) are lead core with a thin steel jacket under the even thinner copper layer. Clearly not green tip, but the water is muddy because there is steel on the bullet (technically).

bimetal bullet steel case ok for the class?