I normally use wsp for all my .357 load, But recently I was given a box of CCI magnum primer. Do I have to compensate the powder charge for these primers? My regular range load is 6.5 grns of unique with a 158gn berry plated bullet. If a load doesn't call for a magnum primer, can they still be used? I suspect they probably work better than wsp for IMR 4227 loads.