I too suspect that the problem lies at the muzzle. Sometimes when guns are vigorously cleaned from the muzzle end with a steel rod we see accuracy suffer dramatically, like this. Check for wear (or other defects) near the muzzle, try diff. ammo. with different bullet weights, cast and jacketed. etc. Clean the barrel and shoot it until dirty.
Options iniclude re-barreling, or relining the existing barrel, a service offerred by the Broom Closet in Florida.
I suppose a guy could try counter-boring the muzzle a half-inch or so IF you have a lathe.
Or sell it off and pick up another.
dju
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