I did a fair bit of pellet testing into soap and gelatine...

Best expanding hollow point was BSA interceptor (but quality control sucks and pellet heads tend to be too small). Next was H&N barracuda hunters (great pellets) and Bisley pest control. Super h point and h&n hollow point don't expand. Best expansion ever was Hobbys fired backwards. Norica killer were also interesting but not accurate and no longer available.

No matter what you use, please make sure accuracy is acceptable at farmyard ranges. Don't expect much from BSAs Noricas or pellets fired backwards.