I think you need to get the term 'rimfire scope' out of your head. I read your questions in your other thread, and I think a 'feature set' is what you need to look for. The SS 5-20 that you already have is the correct feature set, but may be more expensive than you are willing to commit to your rimfire rifle. It sounds like you need a scope with first focal plane mil reticle, and mil turrets to go along with it. Your SS 5-20 has these features, and it's a great scope. I'm sure everyone here has a favorite, but for the right features at reasonable cost, I like the Midway exclusive BSA 4-14x44 FFP mil/mil model. One other nice thing about it is that it will focus down to ten yards, which is a useful feature on a rimfire setup. It also has a 30mm tube, which will get you enough elevation to go past 250yds with a 22, if you're into that. It is a great tool for learning how to use mil/mil, and once you learn it, you'll never go back. I think you'll find it's a huge step up from the Nikon you're using now.