Funny you should ask that Gene, hehe ; anyways I have tried a few different pellets in mine and I always come back to JSB 8.4g. 4.52's . I am beginning to get maybe a little too serious about this pellet shooting; as I started weighing my pellets yesterday, on an small cheap Lee grain scale that I used to use for metallic reloading, sometimes . I'm sorting them on a heavy , light basis. I took a fine pint sharpie and made a line just under and just over the mark on the scale that the pointer levels at. Were talking about a 1/8" space. After zeroing the scale and and setting it to 8.4 grains ; any pellet that falls in that range of my marks , gets put into one tin, the ones that weigh less than my mark , go into another . I haven't found any that were heavier than my marks . I'm thinking the heavies range from more than 8.3g.to less than 8.5g. The lighter ones are less than 8.3g. I'm doing this for better long range accuracy. At thirty yards a grain difference in weight most likely won't make a big difference in POI , but at 55 yards I'm thinking it will. When shooting over a chrony , I've noticed , I'll get a pellets that are way off from the average of the others and I attribute that to a difference in weight . Were talking 20-30fps differences, sometimes more , and that will ,IMO make a difference in POI at 55 yards . In field target on a long target I've missed low and saw where I hit on the target face and on my second shot added a little elevation , only to shoot over the target , this has to be pellet weight differences. I'm talking about aiming differences of between aiming at the top of the kill instead of the center of the kill; The Jsb's are the best I've found but I think they can be made better . So much that I ordered a digital grain scale today to speed up the weighing process . I BET YOU WISHED YOU'D NEVER ASKED NOW , DON'T YOU !!! LOL I'll let you know if it helps. kirby