Pesting Ammo

Depends on too many variables to pick a “best”… for rats at 10 to 15 yards, roosting birds? As opposed to ground squirrels at 50 to 100 yards? State your pesting scenario then ask again. I once went through three tins of premium pellets killing roosting starlings at night. Afterwards I realized I could’ve killed them “just as dead” with less expensive CPHPs. For pigeons on the wire at 100 yards? JSB Exact Jumbos… Lots of variables and choices.
 
Good question, but like others have asked, what is it you are shooting at. Pests come in all shapes and sizes. Some people hunt them with 177 12 fpe guns and do well because they are very disciplined on the shots they take and have devoted the time to become very proficient with their air gun.
I have one gun I shoot slugs out of and another I shoot pellets out of. When I‘m on target the pests are no more dead from the slugs than the pellets. Shot placement is everything.