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I shot a good amount of wolf in a PTR94 and a real HK91 this weekend. I'm pretty sure those roller-lock guns are made to shoot steel.
I think the bimetal coating on the bullets is more of a concern than the cases.
Brass vs. Steel Cased Ammo - An Epic Torture Test
This comprehensive 40,000 round brass vs. steel cased ammo torture test examines at key indicators of ammo performance and cost in AR-15 rifles.
www.luckygunner.com