We live up here in the Oregon hi-country, and wildlife is always pressing in on us, an FX 30 cal keeps them at bay with a humane dispatch, i'm currently using polymer-tip pellets with very good knock down power...
The polymags are pretty awesome the flat head gives you the extra knock down and that little tip effectively penetrates.
Love my Uragan in .30- with slugs or pellets, it flattens them and is accurate in the wind. I've moved to Neilson slugs for 80+ yards, so range estimation isn't as critical as pellets, but I always have to be careful of the background- those slugs will travel for some distance.