I went to the gun range today to practice a bit with my 30-30 and my 270 today. I was seated at the bench with my Marlin 336CS 30-30. Loaded a round, factory Remington Core Lockt SP 150, aimed, squeezed the trigger...click. Checked the safety, off. Pulled hammer back again, aimed at target, squeeze trigger. Click. Gun not go boom. Ejected cartridge, still fully intact. Checked primer, it was dented normally, so I set it aside and put a sandbag on top of it, and waited to see if the powder would finally ignite and fire. After 20 minutes or so, it had still not gone off, so I took it to the guy running the range. He said that it had a faulty primer probably. Does this happen often? It was factory ammo, new, right out of the box.