Had a pound of 4320 about 25yrs ago, turned out it was in a recall batch, which I didn't find out about til a few months after. This was before the internet, so to speak. I had to use a rubber mallet to open the bolt on the min chg weight. No damage, but, it sure woke me up to the changes that can occur from batch to batch. Appears maybe, that batch of Retumbo was possibly a bit quicker, and with a different rifle, that sort of thing can happen.Had a 7mag in a BBR that liked H870, w/160Nos. Switched to a Ruger with a 1in8 twist, it wouldn't get within 3gr of the BBR load, same batch of powder. Didn't get to the same velocity, either. Those loads were under book max.
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