Yes I think it was 5.53 FPE I dropped the decimal point. I moved the bird feeder out into the yard aways. The Rats like the fallen seeds and I am hoping I can catch a few feeding (still, head down) in my safe shooting lane. Most have been body shots, I tried a neck shot and hit right at the base of the neck (works well on Deer) the rat did the death dance then got up and ran away, no doubt it died somewhere. I'm researching picking up a better rifle. Mine has kits available to up it to nine or eleven joules (one even claims 16 joules but I'm skeptical of that one), but most people say don't do it as it will damage the internals of the rifle eventually. I like the extreme accuracy of what I've got, recoilless design. I put a holo sight on it which makes hitting the runners a lot easier. I did make a couple of headshots with my pellet pistol (4 joules), they went down but were still wiggling and trying to get back up. I'm having fun with it anyway. I put up a motion-activated camera, WiFi, daylight and IR that sends a video and alert to my phone when the rats are active.