I've lost more that one deer due to having scope issues of either banging/dropping/or just plain cheap scopes. Anyway I try to purchase the best scope and put them in the best rings/bases/mounting systems that I can afford, and also lap my rings and torque the rings/bases. I know there are more expensive scopes out there, however I have settled upon Leupold VariX III scopes; they are what I an afford, $2000-3000 scopes are not an option for me. But over the years I have had nothing but good performance and continual zero hold with all of them, even after some really hard drops and whacks of one kind or another. I have at least 8-10 Leupolds all mounted in Ruger rings and the Ruger integral scope bases.
Even though I have confidence in the Leupolds, I always take along a spare rifle "just in case" something happens to the primary rifle or its scope. Unless I can shoot that rifle after an incident, I will hunt with the spare rifle until I can check the zero on my primary rifle. If a spare rifle is not an option, I will take along an extra scope, mounted in the same rings that are for the same foundation as those on the primary rifle; just in case! Many years ago I did a caribou hunt where weight was a concern; it was either an extra rifle or clothing and gear so the spare scope came along. I really like the idea of carrying a card along withe a bore sighting tool. As written in a previous reply, is it worth taking a chance when the hunt of a lifetime with the trophy of a lifetime presents itself!!??