well i got 4 jills,2 small,and 2a abit bigger and heavier,all 4 bolt bunnies,and all 4 will kill as they dont leave a bunnie,the 2 heavier ones will, wont let go when they lock onto a rabbit,and my big hob,will bolt them,well they are given the option,bolt or get nailed,so it all depends on the bunnies,not the fert,doesnt matter what you put down the set,if they are disturbed,by noise outside they dont like to bolt,and some times no matter what you do they wont bolt,so not really a right or wrong answer to this question,but as said before,every body has their own favourite,as some ferts wont g