Jim, if I may, I'd like to through in my two cents...
The 742 has issues. You can no longer get parts, well, can't get most of the parts. Remington no longer services this model nor do they have parts. This gun was discontinued in 1979...34 yrs ago.
One of the problems with this model, as well as the older 740, is the locking bolt likes to flop around in the receiver while the action is opened during a shot. Because the locking bolt has several interupted lugs, these lugs beat the heck out of the guide rails in the receiver.
I've seen plenty also having bad chambers. The chambers are not the easiest area to clean. The average hunter does not remove the barrel to thoroughly scrub the chamber, so most end up being quite eroded over time, leading to extraction problems. I've seen some absolutely perfect looking guns, that would tear the rims off the brass because the chambers were bad.
I've got a Rem 742 in the shop right now (for the past year) that has the front of the locking bolt broke out. With this piece missing, the extractor is no longer supported, which then allows the extractor to slip off the rim of the cartridge during the shot.
I've been watching the gun auction sites for this part. In the past auctions, this locking bolt has been selling for $75-$100 (labor not included). I've told the customer its not practical to spend that kind of money on a gun that has the potential to have other problems. He would be way further ahead to part the gun out on ebay, and put the money towards a Rem 7400, if he wishes to stay with a semi-auto. I've seen nice wood sets going for $150 plus.
Now, if you're looking to add to a collection, that's a different avenue. I would just suggest not finding one if your plans are on using it as a primary hunting gun.
I agree 100% with GunDr above. The 740 was replaced by the 742 which was replaced by the model 4 and 7400 which has since been replaced by some newer number. I have had several and it is impossible to get parts. They either work fine or not at all. I have had several 7400's (or model 4) and the shells would stick in the barrel or jerk the edge of the brass off and stick. I had 2 brand new 7400's and one worked fine and one would jam every shot. No longer have any of them. I liked them if you had one that worked. The 7600 pump is easier to work with.
Have one in 308. I have never had an issue with it. Like any other semi-auto its got to be kept clean and well lubricated and CLEANED after every use. AR's are stove piping junk if they aren't kept clean and somewhat wet. Garand actions, well that's another creature.
In all honesty, I buy a Rem 760 or 7600. Like the 870, if you can pump it it will fire. And they are pretty darn accurate. Timney now makes a trigger fix for either which is there biggest sticking point.
Want a dependable 308. Buy a M1A Socom or a Rem R25 (DPMS LR308). You'll need a muzzle break with the later one and a BIG POCKET OF MONEY!