I have seen the long nose, so called 'bore rider' shapes...but for example, in a .224 the usual diameter of this nose is a wee bit smaller than the bore( .218 on a .219 bore ). Excluding the issues it might cause a boolit loaded gently in a brass case, is there any potential benefit to running a bit into the rifling...say a .220 nose on a .219 bore?
cheers,
Douglas