Thanks in advance for any responses.

I have a Bushnell Elite 3200 Rifle Scope w/ Rainguard. For me an expensive scope, about $200 a number of years ago. I put it on an inline muzzleloader, worked great. Moved it to a Rem 870 12 gauge and worked fine for a year or two. Now it seems to not hold its zero and doesn't respond the way it should to adjustment. To rule out the gun and because I wanted another gun, I bought an H&R Ultra Slug gun and put the scope on it. Same problem. We ruled out the shooter by my son shooting it and I his gun and the terrible groups went with the gun with that scope. I know some people say don't put a rifle scope on a shotgun, but does the shotgun kick any harder than one of those big African Magnums.
Heres the question, should I waste the $20 to send the scope in to get an estimate for repairs? Or am I throwing the money away because by the time I add more money to it, I could get a cheap scope that would last as long.

Dan