10-29-2021, 03:02 AM
Manufacturers use non canister grade powder to make their ammo.
Reason is that its cheaper since doesn't need to be tuned for lot to lot consistency.
They get a large shipment (probably 1000lbs or maybe a ton) of one lot of powder and their ballistician takes samples and tests them to see what the power/ burn rate is and then makes a production recipe for that lot of powder.
When that powder gets used up they use a new lot of powder with a recipe for that lot.
Powders for home reloaders are made to be much more consistent, so that that will reasonably match published load data.
Even then there is still a little variation Between lots.
This is one reason people will often buy 8lb jugs or several 1lb'ers with the same lot number.
Reason is that its cheaper since doesn't need to be tuned for lot to lot consistency.
They get a large shipment (probably 1000lbs or maybe a ton) of one lot of powder and their ballistician takes samples and tests them to see what the power/ burn rate is and then makes a production recipe for that lot of powder.
When that powder gets used up they use a new lot of powder with a recipe for that lot.
Powders for home reloaders are made to be much more consistent, so that that will reasonably match published load data.
Even then there is still a little variation Between lots.
This is one reason people will often buy 8lb jugs or several 1lb'ers with the same lot number.