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Above all else, make sure you clean the firing pin and the firing pin channel in the bolt.....squeaky clean.
first range trip:
1) load one round and make sure it fires
2) load 2 rounds and make sure it fires in semi auto mode
3) load 3 and verify step 2
4) load it up and have fun.
I had the misfortune of being next to a guy with a not so de-cosmolined SKS who loaded up 10 and pulled the trigger for the first time. It went full auto and scared the living crap out of both of us.