You will be surprised what it can do. I worked up some computer drop data for my Encore 260 barrel. I dialed in the Come-Up's for 600 yards and put four out of five on a 10" plate the first time. I was hitting the top edge or I would have hit with all five shots. The four hits were in around a four inch group. I had a 20X Super Sniper rifle scope on it when I shot the steel at 600.
I am using 243 Winchester brass at the moment.
Just playing at the Range mine really likes 107 grain Sierra Match Kings.

Bob