I am building a flint rifle with a Colerain 38 inch 50 cal. B weight barrel(1.000 breech,.750 waist,.762 muzzle). Where would I best position front and rear open sights to avoid sight line interference caused by the extreme flaring of the swamped muzzle on this barrel design. Has anyone using this barrel found the best distance from breech and muzzle to position both sights?