According to Blue Book of Gun Values, the Remington Model Four auto-loader, in excellent condition is valued at about $350 +/- US.
This rifle was the predecessor of the Model 740 Woodmaster. The Model 4 (as do the Model 740 and Model 7400) has three inherent issues of which I am aware. These are relatively easily over come.
One is that frequently an issue develops associated with the clip. The clip is stamped metal and the top "curved" edge can be relatively easily bent or warped (if handled roughly) enough to result in feeding issues.
The other two issues are related. The gas operation "dirties" both the gas port and the chamber relatively quickly. Both must be kept free of powder residue. Frequent and adequate cleaning is a must. Otherwise "stuck case" issues can result in ejector damage, and a clogged gas port route can result in failure to cycle.
The 280 Rem. is a great round for deer, though it is not as popular as it deserves.