Not sure about the Buckmaster but their Tactical really impressed the heck out of me. Did some rudimentary box test after I mounted it on my Tactical 308 and here's the result.
Here's what it did at 535 yards and 591 yards
At 535 yards Exbal said dial 10MOA and here's the result of the 3 shot group:
The half gallon water jug was at 591 say's my Swarovski and Exbal want the dial at 11.75. Here's the hit on the jug, just one shot:
Here's where I was shooting using bipod
That's really impressived scope performance.