1. It will not shot a max load well!!! and a 130 gr. bullet better than a 140 or 120 but all guns are different.
2. I have found they shot a flat base bullet is better than a boattail; I use speer hot core 130 gr. with 42gr. of RL15 my gun shoots about a 1in group @ 100yds on a calm day!

3. DON'T float the barrel!! A friend of mine did on his 260 and had to add a pressure point about an inch for the end of the forearm.
Hope this helps!!! Great short range deer gun light my kids use mine more than I do