✔ 最佳答案
The load data manufacturing companies use for commercial ammo is often proprietary. Federal may use powder from Alliant for example, Winchester might use the same powder Federal does but they might add a little more, or less flash suppressant (as an example) than Federal uses. Winchester markets their own brand of reloading powder, which some sources claim are actually rebranded Hodgden powders. Regardless, the load data each manufacturer uses for their cartridges determines the performance. Different powders, different brands of primers, different brass thickness and web thickness all play into velocity and downrange terminal ballistics.