Dang itVan - afraid of a little wind. Why don't you come up north with us and we can laugh at you trying to drive on the snow and ice.
Well when you get to the range, be sure to have a hammer with you to knock them .457"bullets down the bore. (at least until it gets the rifling cut into it.)
But even if they shoot good, how you going to load them in the field? I think the .452" is tight enough. Maybe .453 or .454 is loadable.
Second guessing, you sure you want to start a 457 down the bore??????