snakes
Pump shotgun for sure, short barrel, slug or riot type, just for ease of carry and storeage. Ranges would be close I'm thinking. Also thinking I'd go with a 12ga, and simple 1-1/4 oz shot loads. I dunno how thick the skull on a giant anaconda could be? Does one really need buckshot? Beats me.
But at 30 ft or so, a load of relatively heavy bird shot to the noggin would kill a lot of stuff. BB's or #2 lead? Don't think I'd go smaller than that, or larger than #4 buck. I dunno.........never handled a snake that big.