worked at a gun store for a6+ years selling, mounting scopes,gun repair, etc. not to say that i am right but if this is a new scope and this gun has been sighted in before with a differentscope. it very well could be the scope. these mounts dont allow you to adjust left to right.if it is a new gun it could be that the hole in the topof thegun couldbe off a little. (that does happen) my own opinion though swift scopes are over the counter exchangefor a reason (at least they use to be ) you may get one to last forever but then get one that is not worth 2 cents. this is just my two cet worth without seeing the gun/scope. hope it helps.