Hello, The Semi Auto is a great tool for vermin control and I personally feel it offers many benefits!-The benefits are in regards to hide safety as you can not breaking the barrels to insert cartridges in! Secondly recoil is reduced so always a bonus! Other benefits include can deal with heavier load cartridges, if a third for 3 shot auto is needed then it is good as duck shooting you might need that 3rd shot or pigeon shooting when a good number come in!-doesnt mean you will get it though!!! Over and under are still good as I have both and over and under are good for more profound side to th