Hi I am new to this forum and I am not sure if this the right spot to post this question. But here goes. I have a Umarex Surge XT .177 cal air rifle. I have been using Gamo Rocket 9.6 grain pellets that I bought when I bought the Rifle. The rifle has a cheap scope but after sighting it in the rifle was fairly accurate up to 40-50'. I bought some H&N Barracuda hollow point pellets based on the great reviews and to try something different. The first shot was 4" low and 6" to the right at 35'! I thought I must have flinched so I shot again this time 5 shots. Not a very tight group and all low and way right. I figured I must have bumped my scope and tried sighting it in. I was able to bring the group up and left a little but no matter how much I adjusted (I kept track) it would not move over and up to the target. I reset the scope and for the heck of it ran a Gamo Rocket through it and was 1/2" high and right of the bullseye! I was amazed to say the least. I ran a H&N through it again and bam approx 4" low and 6" to the right and a sloppy pattern. I am new to air rifles and I have read that you have to find the right ammo for a particular rifle, but, is it possible to be that far off?? Do pellets differ that much? Does it have anything to do with the silencer? I am anxious for feedback on this one.