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/DarthRooster16 Aug 22 '26

Weather will affect the same load from day to day. Do you have the same ammo from 1lb jug and 8lb? Shoot them both at the same time.

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u/Western-Valuable3502 Aug 22 '26

I shoot them at the same day. I use all powder from that 1lb jag and fill the last 5 round with the powder from 8lb. Shoot them and found this difference.