Never used a VX5, and not looking to bash it, but I wouldn’t trust that scope unless/until it shot a damn fine tall target test or three and then returned to zero and shot a small group.
Heck… just do the poor man’s version. Shoot a shot at 100 yards, dial the scope up 15-20 MOA, back to zero, shoot a shot, repeat. If the group isn’t “under an inch” then Houston, you have a problem. If it passes that test, then shoot a tall target test. It should print those groups “under an inch” right up the line. I had a Zeiss that did ok in terms of elevation tracking/repeating but around, if memory serves, 12 MOA from my zero it’d print about an inch to the left of the line. I have a Swaro with a reticle canted slightly relative to the adjustments; as you dial up, the shots just gradually drift off to the right of the centerline. No bueno.
All this stuff adds up. Some scope tracking error… some wind call error…
And, bullets. I swear to you, if you haven’t tried 162 ELDM’s in your 7 mag, they will up your game all by themselves.
