(Ack! Don't do it!)
Or, more reasonably, don't buy many, to start out with. Those you do get (don't, but when you do), try a few tests for penetration and accuracy. If they meet your demands there (ha!), then test for reliability.
Good luck, mano. Personally, I think you'll have less success than I did with the evil "plastic cored anti terrorist training rounds" I bought in 7.62x39mm years ago. Only ammo I've seen that could make my SKS rifles malfunction...
John