Id like to improve the 50 yard groups of my 10 bore sxs. I have been working on many loads for several years and can keep within 8 inches at 50 yards. I believe I can improve that with some rifling. My old english paradox gun (Hollis 12 ga)has very lite rifling and shoots under 3 inches at 50 yards, so me thinks its doable.Anyone know who I might contact to inquire about rifling my barrels?