I have been using the bushnell fusions with decent results, getting p-dogs to 300 plus, mounds to 450 and yucca plants out to 700ish. A lot of times I try to hit an object that is bigger than the pdog that is close to it and use that range + or - to the varmint. Has been working for me. I also try get what ever elevation I can so I am not ranging across a lot of flat ground, however that is not always possible, but most of the time it is. Just my experience/opinions and worth just what you paid for them.