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My chart says I need 4.5 MOA or 62 clicks
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4.5 Mils not MOA
A mil is about 3.6 MOA - I try hard not to fool with mils because I am easily confused by words that start with the same letter.
62 clicks will give you 15.5 MOA (there are a couple of digits on out there but I ignore them. Maybe a MOA is something like 1.047 inches or so at 100 yds)
You also should remember to give yourself about 3-5 MOA or inches at the top as free board so you do not shoot when the scope is turned to close to the top end of the adjustment.
Abinok made a good post on shims about two years ago. Basically every 0.001 inch of shim thickness under the rear base will give you one MOA. (different for a short action and a long action). Aluminum coke cans or beer cans can be cut with kitchen shears into shims. My experience was that about 0.02 was about all I could get under the rear and get tightened back down tight. If you have two piece bases then you need to be careful not to bind the scope. There are a couple of other posts on the subject.
Right now on the 240 Wby I am runing something like 10 MOA shim under the rear base and maybe 20-30 MOA in the inserts of the rings.
You definitely need the rings I have if they will fit your scope diameter and base style. Send me an email with your address and I will ship them.