I read constantly about leupold failure.

I'm not doubting any of it.

My question is, is the problem that when dialing for range they don't do so reliably/return to zero? Or do they fail to hold zero period?

I ask because I'm looking hard at a fixed 6X the intent being to zero and shoot/hunt. No dialing wanted. Set and forget.

Bore size is no substitute for shot placement and
Power is no substitute for bullet performance. 458WIN