Not necessary for it honestly. When I started loading .308 years ago, I worked them up with magnum primers as the old sages at the time told me they used one for any hunting loads where it could be sub 32 degrees. That advice likely came from the days of old with double base ball powders and their temperature sensitivity. These days with temp insensitive powders, that likely is no longer an issue. Magnum primers theoretically will increase pressures so always wise to work up, but it’s likely minimal.