No, No No! Don't Don't Don't! Back in 1985 I bought a brand new Remington 7400 in .30-06. And put a nice Leupold Vari-X III 3.5-10X 40 MM on it in Leupold mounts and rings. I cleaned and lubed it, took it out to the range with a couple of boxes of Winchester Super-X 180, grain Power Points to sight it in. Loading single rounds I got through about half a box and problems started. When I hit the bolt release the bolt wouldn't lock up.
This got worse until after about 20 rounds, it wouldn't lock up at all. I managed to get it sighted in, cased it up, and headed for home. When I got home I cleaned the chamber, (which wasn't that dirty), relubed it, and put it back in the safe. When I examined the fired brass, they all had what appeared to be a transfer mark of a galling from the chamber wall, on to the brass.
So my guess was the extractor was fighting trying to get the brass out of the gun, because of galling in the chamber. Most likely because the chamber was cut at the factory by a dull chamber reamer. I don't know if the extractor got bent or damaged as the problem worsened, because I lost interest in the gun after that. Not to mention I couldn't find a gunsmith who wanted to touch the thing. After I got a computer and got on the Internet a few years later, I started researching these guns, and soon found out they are extremely problem plagued in most every regard.
I almost bought the Browning BAR, and boy do I wish I had! They have very few issues compared to the 742 / 7400 Remington series of high power semi's. Yes, you'll pay more, but you won't be buying into what is almost a sure headache. You will find the few guys who have these guns that run well, are usually, "a box a year", deer hunters. Not guys who put high round counts through them.
One of these days when I get bored, I'm going to try to locate a good gunsmith, who can possibly get it up and running for me. But for now I've got so many semi auto rifles, AR's and M1-A's that run good, I just don't have the inclination to screw with the damn thing. Also, remember if your heart is set on buying one, most of them that are for sale are usually afflicted with some type of problem. So, "buyer beware" really applies to these things. If you really like the style of these rifles, (and they are a nice looking rifle), go with the 7600 Pump Action. From what I've read, they run much better, and you still have the same sleek lines. Without all of the operational issues, that follow these things around like a sailor on shore leave following a hot hooker.