While it's true to be said, "It don't hurt" cause it doesn't, it's also not really necesary. I've always heard it said it involves the virgin metal bonding with copper jacketing, and creating a type of permanant fouling. I regard that as nonsense. I've experimented with several new guns, both breaking them in and not. Considering that they were all different brands, I've never owned a rifle that shot over an inch at a hundred yards. And as for saying a properly seasoned barrel lasts longer, I don't buy it. But thats just my opinion. BUT, make sure you clean a brand new gun VERY carefully. They come from the factory lubed up, and I've seen guys come to me crying there cartridges or shells wont chamber,(crap in the chamber). As soon as I look down the bore, chances are it hasen't even seen a patch run through. Also, if left uncleaned before the initial firing, you may have yourself a nasty case of excessive pressure. Take care.