Welcome to the forum.

No, you'd never be able to find out exactly what powder was used in a factory load, odds are. And if you did, you might not be able to get the same thing.

OK.... why won't your reloads eject? If they go in the chamber, and fire OK, then you probably just don't have enough oomph to cycle them. I'd consider working up your load just a bit.

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MikeG