One thing you may want to look into is removing all stock material touching the sides of the barrel and putting pressure points on it. I free floated my winchester x-150, updated my sights and am right at 1" groups @ 100 yards with open sights. I bet removing all that material that touchs the sides will help tighten the groups. Or do a paper sheet text, run it between the stock and barrel and it it doesnt run down to the first lug, start looking for areas where the stock is pressed up against the barrel.
Good luck with it, I missed the cabelas deal thanks to some goof ball taking forever to pay for some items he bought. I missed it by less than a week before they sold out.