The good folks at Marlin must not cycle their test / proof loads through the magazines of the rifles before applying the final seal of approval. How did I come to this conclusion? Well, when I took my brand new 336Y to the local pit to see how she worked, I was disappointed when the cartridges would not cycle properly. It seemed that the lower portion of the extractor hook was digging into the rim of the cartridge as it was coming up in line with the chamber. A few strokes with a file and stone took care of it. Any of you have the same problem?