Greetings,
I have not used slugs but from my reading, in a smooth bore, they are a short range option, very short. Fifty years ago a .303 was a cheap option hunting rifle but no longer. They are no longer cheap and many, if not most have well worn barrels. Add to that the difficulty of scoping and an older commercial rifle would be a better option. Have a talk to your dad. If he has rifles he is likely to have mates that do to. One of them is bound to have something suitable. Perhaps a .308 for the cheap and available ammo.
Regards and best of luck Grandpamac.
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