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I ran out of my standard powder (Unique), and since the replacement shipment was due after a range day, loaded up some .40 S&W with AA7. 10gr behind a 155gr TMJ slug worked fine, but was a bit spicy for a night's worth of steel shooting, so tonight I loaded them at 9.5. Shot fine, but I ended up with a gun-full of unburned AA7. As far as I can tell, no rounds spontaneously disassembled - they had a nice, tight crimp, and there were no components unaccounted for. Is this a problem with downloaded loads of mid-speed powders? It's also noticeable in my light loads of Unique for .455 Webley.

I'm switching to Titegroup and Trail Boss for .40 and .455, respectively. I know the former works, and the latter has a burn rate equivalent to bullseye, so...
 

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Yea, a lot of the time when you drop pressure you will have unburned powder. I would recomend staying with the recomendations in a reloading manual. Even then with low pressure loads it is common to have a little unburned powder.
 
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