I've loaded 180gr FP bullets for my 357 mag rifle. They drop considerably at 100yds so you better know your drop table.
I like the 158gr SWC HP, it works great at distance and has enough at 100yds to get the job done.
Personally I wouldn't shoot past 100yds, but anything closer, you should get your knife ready.
Lil Gun works good but don't shoot long strings, like more than 5 shots as the barrel gets REALLY hot, as a result I've sort of steered clear of Lilgun for plinking and general shooting. I save it for my hunting loads, yes it gets a bit more velocity and that is why.