Curreny both my daughter and I are shooting my S400 in benchrest comps. As Rosie is only 12 she had our gunsmith cut the stock down by a couple of inches. No I didn't really get much choice in that! I recently managed to aquire a nearly new replacement stock, the rifle is about 9 years old. I have removed the stock before and when replaced it did not affect the zero. When we now change stocks though there is a very consistent 2 moa variation in elevation, with the gun shooting low with the new stock. I have shot the gun with the old shortened stock, and off the bench both of our zero's are the same. Just to make clear the only difference is the stock, I am even using the same stock screw in both stocks. I would not have expected changing the stocks would have changed the zero by that much and so consistently. Dose anyone have any really good ideas why ther should be such a consistent variation between the two stocks?