I see allot of good suggestions here.It sounds like a defective scope to me.Universal scopes made in good old Hialeah weren't the best quality.I'm sure they were made by Universal Firearms of Hialeah FL. They made allot of M1 Carbines.We sold hundreds of their Rifles and their little Enforcers if I remember they were called. They were a 30 MI carbine made as a pistol.I lived not far from where they were located and work for a gun shop in Hialeah.As far as I know they are no more.I would suggest mounting a decent scope on that Remington.I'll be willing to bet my bottom dollar the scope is the culprit.Or take that scope in question and mount it on a rifle you know to have constant accuracy.If it proves to be the scope there would be not point trying to have it repaired.Since Universal is gone it would cost more trying to repair it.Chalk it up to experience and buy a better quality scope next time.The rifle can only be as accurate as the shooter,scope and ammo will allow.Don't take me wrong. Way back I bought cheaper scopes.I found you get what you pay for in optics.

Ruger Redhawk