It's a $50 rimfire scope, I wouldn't trust a $50 centerfire scope either.
Honestly, if you want to stay cheap, Bushnell has a bubble pakage 1.5-4x shotgun scope that holds up to 12ga's fine, much better than the 22mag scope and a better magnification range for .30-30 too.
Other than that go for something in the $100-$150 range. 4x is fine.
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