I recently just got to take out a new build. Its a 116 flat back timed and trued by Stockade Stocks with one of their stocks and their recoil lugs installed the barrel is a Shilen SS 26 inch heavy sporter in 7 mm mag. I loaded up 20 shells touching the lands with 61 grains of 4831 and another 20 using 61 grains of 4350 I sighted in close at 50 yards to get on paper and all shots were touching so I was pretty excited but when I moved out to 100 yards everything went to sh&*%. I couldn't get a group under 2" with no real pattern just all over. My next plan is to back off the lands in .050 incriments until it tightens up the go back to powder changes. Any thoughts?