20 Gauge for Female

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Do you all think a 20 Ga with a slug barrel is too much for a small framed female to shoot as a deer gun. I am looking for a firearm for my wife to use and she is smalled framed about 5 feet tall and I don't want to sit her down when she shoots something. Alot of the rifles - even carbines - are too heavy for her but she likes the weight of the single shot H&R - Georgia only allows 20Ga or larger so I am wondering if it may be too much for her.