For the money and just short range varmint use I am hoping the rattler lives up to the reviews I have watched. I’ll let you know this weekend when I get some time behind it. As far as calibers that I can get my cans on, 22lr, 22WMR, 17m2, 9mm out of MP5 or KP9, 5.56, 6.5 grendel, 6.5 creed...