If you are serious about airgunning, particulary with magnum class air rifles, you'll want one of these heavy duty Champion traps.  You won't have to worry about light weight construction seen in some of the others.  Claimed rimfire rating, but I have not tried it for that purpose.
Pros: Heavy steel plate handles rimfire and magnum air rifle pellets.  Pretty much everything stays inside once the bullet or pellet goes in.
Cons: Rings loudly when struck. Difficult to dump out.
                    
This review was written in the old system and had content requirements that are different than reviews written today.