ORIGINAL: driftrider

First, select a scope that has at least 3" of eye relief at the maximum magnification. Then make sure you mount the scope so that it is in the correct position for you when you mount the rifle. When you shoulder the rifle you should see a full, bright and clear view through the scope without having to move your eye forward or back on the stock. Shoulder the rifle naturally and adjust the scopes position for you.

Then at the range when shooting from a bench, be mindful of the fact that most people tend to creep forward on the stock. When shooting from the bench, pay attention to the image in the scope. If it looks like it's closing up on the edges (tunnel vision), or is dim and fuzzy at the edges, you're head is in the wrong place. Move so you see a full, clear image in the scope.

The best suggestion would be to not shoot off the bench or from the prone position too much. These positions tend to put the shooters face closer to the scope than offhand, sitting or kneeling. If you do plan on shooting this rifle a lot off the bench, I'd consider having a muzzle brake installed. With a cartridge like the .300 RUM you would likely see a roughly 50% reduction in recoil, making the 300 RUM kick a lot like a .30-06.

The best thing you can do it just be careful to shoulder the rifle correctly and have the scope mounted correctly to take full advantage of its eye relief.

Mike