#4 shot is getting on the small side is getting pretty small for coyotes unless they are pretty dang close. try anything between BB to #4 buck works good. federal #4 copper plated buck seems to shoot good for everybody. i really like the remington wingmaster in BB's it is very expensive, but it is amazing stuff, the penetration at 50yards is unreal. quite often rem. has rebates on it which get it down to $15 a box of 10, whish is reasonable. besides how many are ya going to burn up in a day. no matter what ya decide to do throw a few down range, check the patterns and make sure they're hitting where they should be. good huntin.