Jim:It is a Benjamin Trail NP All Weather.22 caliberI have tried three pellets so far. I should have three different tins by the end of the week.1. Crosman Premier Hollow Points: used these for break in. They grouped OK in the beginning but started to spread. Sometimes they group great and other times at an inch or so. But fairly regularly I get a flyer 2 or 3 inches off. Since I got this gun for pest control I can't risk the flyers.2. Predator PolyMags: I so wanted these to work. But they fit too loose in the barrel and don't group at all.3. H and N Field Target Trophies: I have had the most consistent groups with these although many times when I pick the gun up the first shot is a flyer low and too the right. I don't get that. I am fairly experienced with firearms and am confident that I can shoot a good group. One hole's not a problem at 25 yards with any of my .22 rifles. Currently I sit in a chair with a sawhorse infront of me, rest the foregrip on the back of my hand and support the back of the rifle lightly enough that it can move backwards under recoil.I got the rifle and broke it in with a tin of CPHP. After not seeing much improvement after 500 rounds I broke it down and gave it a light tune. Cleaned the bore with JB non-embedding compound, replaced the "Factory Damaged" seal with a Titan, cleaned and moly'ed in the right places, and polished the sear to smooth the trigger a bit. Switched to a 4x16x40 Centerpoint scope, moved the rings all the way forward and all the way back, and loctited it all over night. 50 rounds or so after the tune it was shooting really well. Before the tune my groups were over 2" at fifteen yards. After, I was hitting 3/4". For some reason that has been opening up again. Best I can do is a 1" group now at 15 yards. The weird thing is I can hit a:1" group at 15 yards, 2" group at 30 yards, and then1 3/4" group at 50 yards.The gun is just very temperamental and inconsistent to me. I just got up from writing this to shoot five pellets. First round dropped 1 1/2" low, then three pellets touching, then another 3/4" low off the group. The thing is, they all felt like good solid shots to me. I didn't pull anything and I could see everything through my scope so my follow through was good. I believe that the gun just shoots all over.My replacement will be here tomorrow so maybe that one will just tell me I stink at airguns. ;-) I hope not. And guys, there is no cost in a return. Amazon overnights a replacement product out to you and gives you a return shipping label and 30 days to return the first unit. Very easy. I buy everything I can through Amazon. Always painless no questions asked.