I recently purchased a used Vortex Viper PST 4-16x50 FFP scope and a Night Force 2-piece Rem 700 long action 20 MOA base. I'm planning on installing this on my Rem 700 in .25-06. I bought this rifle used over 10 years ago and I don't know a lot about it. As I look at the barrel it looks like it tapers quite a bit in the first 4 inches and at the end of the barrel it ends up at about 5/8" diameter. What kind of barrel contour do I have? Where can I find diagrams of various barrel contours so I can understand them? Will the barrel contour I have affect my choice of rings? Thanks.