I've never had this problem before, and, as I don't usually shoot factory ammo, I'm curious how common it is.
When I found out Down Under was going out of business this summer I sent my wife in to pick up some 35 Whelen ammo for me since I was in the Lesser 48 at the time. She got the last box. All I really wanted it for was the brass, since I could buy the loaded ammo from Down Under cheaper than I could order new brass.
Anyway, about a month ago I was doing some shooting and had a misfire. This had never happened to me before. When I got home I pulled the bullet, dumped the powder out of the case and examined the primer. Everything appeared normal, and I just wrote it off as a fluke which I was lucky to catch at the range rather than in the field.
Today I went out to try out some loads I have been working up for the same gun and took the last 3 factory rounds from this same box with me. Out of 3 rounds, 2 were misfires. I haven't pulled the bullets yet, but I'm sure I'll find the same thing I did before.
In the past year I have fired 2 other boxes of Remington factory ammo in this gun with no problems. I've also fired handloads without any issues. Needless to say, I'm not real impressed with Remington right now and I sure wouldn't recommend that anyone go out after dangerous game (or even plain old house cats) with their ammo.