veteran scope rail

I bought a taipan veteran .25 and noticed that the scope rail is slanted downward I guess for long range shooting. None of my scopes have enough adjustment to zero my rifle in. I run out of downward adjustment with the gun still shooting several inches high at 60 yards. This is really confusing. I cant find any rings that I can use to take out this angle. What do other veteran shooters use to correct this?
 
Sounds odd to me !

UTG pro makes a nice one piece mount that works great on mine!

James from Michigan 
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I will correct myself, I searched again and found some fx rings for weaver rails. Also, my scopes are not cheap scopes. I have 3 burris timberline 4-14 scopes, that are wonderful airgun scopes. If I am figuring it right 20 moa is 6 feet at 100 yards that I have to dial out, less drop at that range. Thats a lot of correction. Anyway the fx rings will get me where I need to be.Thanks for the responses.