No definitive answers, but you can hedge your bets. First, follow Formids scope mounting process that is a sticky in the optics section. Second, use hell for stout rings and bases, preferably a picattiny rail. Third, use a scope that is known for zero retention. Night force, swfa, and S&B come to mind. There may be others, I am sure. Your chances of a "bump" causing a problem is minimal, at best. I use a swfa scope, and it gets the crap beat out of it day in and day out. In the last 6 years, I have made just 2 clicks of adjustment. I can live with that. I hardly ever check my zero any more. It is always on.
