Dan is the man on these conicals. He suggested over onDWB's forum that he would gladly skip one of the now two-step sizing operationhe does at .504 which should result in just a wee bit greater diameter. Even lead has a slight amount of springiness and the second sizing brings them to a true .504 (by my mic'). A tiny amount of resistance going down the bore might give some additional resistance so far as the bullet coming off its seat, buteliminating the wad would surely do the same.The wads may or may not be contributing to your very good accuracy (they surely are not hindering it).

Since you are blaming things on UC , whar'd ya git da info fer dat sight?

I envy your obviously good eyesight. Good shootin!