Was thinking of having custom turrets made for our scopes for upcoming Elk hunt.I don't plan on shooting more than 400-500 yards.My range finder computes my holdover or under so I could adjust with my factory turrets.Do a lot of you guys use them and why?If I get them for where we are hunting this year and then hunt someplace that is at different elevation would I have to have another set made?Any thoughts or help would be appreciated.