Confirm rifle zero at every opportunity
An instructor and colleague in Oklahoma makes this important point about zeroing serious rifles:
“Many of our rifle students do not have access to private property, nor ranges that afford them the opportunity to sight-in rifles at whatever distance they might choose. On the contrary, most of us are limited to public shooting facilities, indeed mostly to pistol ranges, where targets can be set only at pre-established distances. Nearly every such outdoor public range has a targets pre-set at fifty yards, which comes out to forty-six meters.