Scope failures? Unfortunately I've had a number of the older Zeiss Conquest series scopes let go. After so many years of experience with them it just seems a matter of time, or more accurately shots fired before they will let you down. They might be fine on lighter recoiling rifles, but nothing of any significant recoil. Darn shame as I really liked those scopes for the cost. Michael McCourry who developed the B&M series of calibers would run thru Leupolds like water through a strainer it seemed. They just couldn't withstand those heavy calibers. Last trip to Africa there was gent in camp with a .300WBY and a Swarovski on top. After a few misses, we figured out it was the scope. So the best do fail too. But put me in the camp where shooter failures far outweigh equipment failures.