Have a 742 carbine in 30-06; shot my first bear with one like it.
Guys that had the one I used back in the 70s, literally drug them through the swamps bear hunting, tossed them under the truck seat when they got back to the hill, and that's where they rode; all the time, year round. Never properly cleaned them; about once a year, usually just before hunting season started, they'd wash them out with the water hose, blow the water down and let it dry, then spray the gun down with WD-40 and wipe the excess off. (No... I am not joking! I was totally astonished the first time I saw them do this.) One of the two guns made it to the swamp every time the dog box opened. Not once did either ever fail to feed, fail to fire, or jam in any fashion. The one BAR in our crowd however, carried in a soft case everywhere it went, carried in the house every night, cleaned every time it left the house, band-aids applied and tears shed every time it was dinged; jammed every time the owner carried it in the swamp.
My 742 had issues when I bought it, middle of the chamber was slightly larger than the ends of the chamber, causing a slight bulge in the middle of the case. Would not extract hot, soon as it cooled it would fall out. Scheels footed the bill for repair, assume the chamber was reamed .001 to repair it, no indication the barrel was replaced, but it's worked faithfully since it came back the second time. Over the years have run across a half dozen other cases of Remington's doing this, not sure what causes it, unlike my case where I had no history on the gun, others knew what kind of rounds had been through theirs. No rhyme or reason to it, several had never seen anything but factory ammo.
Beautiful job on the restoration!