It's your barrel length, if you want more velocity you at least a 22 to 24 inch barrel if you re barrel I'd get 1in 9 twist.Yes, that's what I read and my experience with Hammers too. Not sure why I'm 250 fps slower with 4 inches less barrel. I should be closer to 120 fps slower max. My Varget must be too old. I'm gonna open a new can and check it again.