Reloading BOO BOOs and incidents

[32-40win]

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.

[Papershredder]

Originally Posted by 32-40win

Appears maybe, that batch of Retumbo was possibly a bit quicker, and with a different rifle, that sort of thing can happen.

Yep; exactly what I was thinking. Change one variable in an equation and the answer can become radically different. I this case it was two variables; different rifle, different batch of powder. The 180 bullet used to come up with the 100.5g max load must also be quite a bit different than the 180g Accubond. I'd bet the Accubond is a longer bullet.