two years ago i bought 2 boxes of rem corelocks in 30-30.

the first box had 3 duds, firing pin marks in each of their primers but no bang. reloaded the 3 for a second try and still no bang.

the second box had 1 dud, tried firing a second time and still no bang.

that was enough for me, never buy them anymore.

P.S.: i waited before i tried to shoot them again and know it's not a generally accepted practice to do that.