Here's the deal. Shot my Remington 7400 for the first time in about 10-15 years. Remington 165 gr. I got a 3 in group about 9" to the right at 9x on the scope. Zeroed it in and was getting 2-2 1/2" groups at 100 yds. Went back a week later with Nitrex 165 gr and shot a tight group but about 9 in to the LEFT! I noticed the zoom was at 4x. It's a Deerfield scope that's about 15 years old. I tweaked the scope to the right some and got back on the paper with Remington ammo. New scope time??