hello all. i have been a member here for about 12 years. although i changed my handle a couple of years ago. i used to be "bowhunter" anyway i look a lot but post little. i have been handloading since 1967 as a young boy and casting since 1981 i have never used a fast pistol powder in rifle. i have a 8x57 with .323 bore i want to use unique in. but what troubles me is the amount of air space with a 200gr. cast boolit and 12gr. or so of unique. do i need a filler on top of the powder? i see no reference to doing that,,,,,,,,,,,