I have a leupold vxiii 6.5-20x50 with 30mm tube and Tactical milling reticle. I woyld like a little more power. well as much as I can get. I like the specs and reviews on the sighgron siii 10-50 but its a lot of money. is it worth getting an optical booster or would I be better of getting a completely new scope? also do the optical boosters just add like say if its a 20 power Max would it just become 23 if its a 3x booster? how would it effect the Tactical milling reticle. I would have to relearn the mill sizing.