If you don't use the exact same components then you can't rule out variables.
You are using different primers and although you wouldn't think it would make that much difference you really have to compare apples with apples.
I know I need to use the federal magnum match, federal magnum no good.
Some good bugger on this forum if sure could throw u a few primers for you to check.
I would say its a combination of new batch of powder and different primers
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