I recently acquired and Evanix rex in 25 caliber in great condition previous owner has shot nothing but slugs through the gun with great success he shoots a much heavier slug than I'd rather shoot does anyone have any experience with this gun throwing slugs down range I'd really like to stay around 40 to 45 grain he has been shooting 70 to 77 grain Arsenal slugs any tips or pointers or preference from an owner of this gun would be much appreciated thank you