I had a 4.5-14 Nikon buckmaster on my Remington 700 sps tactical, and after every 3-4 shots, I had to readjust the scope's magnification back to 14. It got aggravating after awhile, so I took it off, sold it, and bought the Fullfield II in 4.5-14x42. Problem solved, and I get 1/2"-1" groups at 200 yards depending on the ammo. I like it so much, I bought the 3-9x40 for my DPMS sweet 16, and plan on a 2-7x35 for my new Vortek muzzleloader. I have Leupold on everything else that's scope, but I really like the Fullfield II line.