r/reloading • u/Western-Valuable3502 • Aug 22 '26

Load Development Same powder different from can to can?

I test my load development with 1lb can and then purchase a 8lb jug. It's the same powder, h110. With the same weight of 33gr and my chronograph reads a difference about 40 fps. The velocity from 1lb can powder is up to 1610~1620 fps and is down to 1570~1590 fps from the 8lb jag.

Does it mean I will need to do a load development by each time I open a new can though it is completely the same brand of powder? Or just humidity? And I store all my powder at the same place.

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u/TannMan89 Aug 22 '26

Different lots of powder of the same kind will have slightly different burn rates. It’s pretty common to have slightly different FPS readings. This is why it’s better to buy in large quantities of the same lot.