Ammunition Lot numbers matter

This is why I still prefer to load my own, even with the quality of factory ammunition increasing. If I notice a difference in velocities from one lot of powder to another I can adjust my load then. I totally understand that if you're teaching classes that it would be difficult to keep up with the ammo demand, so factory is the easiest solution though.
 
Thank You very much for this veido I'm a reloader but this information is new to me but as a wine maker the littlest change in a receipe changes it completly and now so it goes in ammo too learn something new again thank you.
 
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