The Krackensystem is a multi-cal system. You can run anything from a 6 mil creed-more to a 338 lapua, 300 norma, and a 65 PRC and we can guarantee it will return to zero in .1.
That allows you to sight a scope on one barrel switch the barrels and sight it in on another barrel. When you put it back on the original barrel you take those offsets put it in your kestrel and your ready to rock and roll on that barrel.
https://youtu.be/Tci78d0JMDI