Hi Guys, trying to find load data for .30-06 Nosler Partiton 180 gr. Every source I find on the net gives different muzzle velocity for the very same bullet. Might be a noob question, but isn't it an optimal MV for every type/weight of bullet, and every powder manufacturer should try that bullet to have the same optimal MV? I have Vihtavuori powders (150, 165, 550), but looking to other manufactureres load datas (cuz no Partition data in VV reloading guide, only another 180 gr bullets), couldn't find unified MV to try to reach. How to determine which type and how much of the powder?