I have had 2 a 742 and a 7400. The 7400 is better and I still use it. Faulty or dirty magazines can cause jamming. The 7400 has been a reliable deer killer for over 20 years with no problems. However as others said, do not do mag dumps. Keep it clean and in normal hunting use it will be fine. There is a company in Minnesota that can convert them to pumps. Garands are ok but heavy and like the Remington, do not like hotrod loads.
If I were to replace it, I would look at an AR-10 type in .308. I like the Armalite. Or a Browning BAR, or Winchester version.