The loading companies use propellants which are generally different in some respects from canister powders sold to reloaders. No big deal, as the loaders generally will test each lot of powder they receive and use the quantity needed to get the desired internal and external ballistics. A powder lot can be 50,000 pounds of powder, maybe even more.
Canister powders sold to reloaders are blended to produce near-identical and consistent ballistics over a long time period, so that a container of powder you buy today will be the same as a container of the same powder you bought 15 years ago. The commercial loading companies do not have that same need for powder consistency as their ballistics lab establishes the proper amount to use before quantity loading begins. When they switch to a different powder lot, they do more tests.
Last edited by DWalt; 09-04-2020 at 04:16 PM.
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