I ordered a Shepherd scope for a client/friend when I had my FFL about 22 years ago. Yes, they are fine scopes, but over-priced. You can do the same one-shot sight-in with any scope.
1. Bore sight your rifle & remove turret covers.
2. Set your target at 25 to 30 yards.
3. Fire one shot (use sandbags to steady...I also use a bi-pod).
4. While the cross-hairs are on the target's center, use the turrets to move the crosshairs to cover the bullet hole.
5. Replace the turret covers. You're sighted in.
6. Repeat the 1-shot sight-in at 100 and 300 yards to assure sight-in.
These are precisely the directions with the Shepherd scope. By the way, it was an elderly WWI vet who taught me that process. He was in his 90s and still hung around Bald Mountain Gun Range daily. Seems some of us young pups had tricks this salty old dog could teach us. His name, just for the heck of it, was John. RIP John! 8^)
Good luck.
Geno