Whats' a Leupold FX ? never heard of 'em....
Leupold has super Customer service, and both you thallub and the op should have contacted them for some technical guidance...I have three older Leupolds that I purchased over time,, they are all super scopes with no troubles and they have stayed zeroed through countless handload testing as well as commercial cartridges,,,,... sounds to me like maybe you both might got lemmons,,, whats the odds???? (buy lotto tickets boys).
Thanks for coming!