I can`t help you with data, but I have shot alot of Calhoon bullets in .17 cal. They seem to be harder than most other varmint bullets and seem to be eather real accurate or real bad, depending on the gun. My .17AH is a real tack driver with the 19 gn. Calhoon`s and I had a .17 Rem. that loved the 28 gn. bullets. They are not a fur friendly bullet but excellant on larger game like coyotes and real good if your not saveing hides. Give them a try, if they are accurate in you gun they do a good job if your not saveing hides.