I have an old Colt that when I slug the barrel I get .454-when I slug the cylinder throat I get .451. This Colt revolver was made in 1904. I don't want to ream the cylinder. I have a mold that will produce a 255 gr. bullet at .454-.455. Should I size them in my lubesizer or load as cast.If I do size, What size die would you suggest I use.If I load as cast is the bullet too big, could it cause damage. I cast them relatively soft. Any help would be appreciated