How many use them and what brand and power do you use? I have been thinking about the fixed nikon buckmaster 4x40 mm power for a calling scope. I have bigger scopes but always have my scope on low power when calling, plus the lighter weight. Why I like alot of power in a scope is I have trouble seeing the target good at 100 yards when sighting the rifle in, I might have trouble shooting of the bench at 100 yards with a fixed scope. Just a thought, lets here what you think and have.