[Riverpigusmc]

Originally Posted by brownie

No compression with fillers, but with some loading real powder puffs, depending on powder used, it can be so little compared to case capacity ignition is spotty and I've been told as dangerous as a double charge.

Yep, some IMR powders are more dangerous with an undercharge than an overcharge. And some pistol powders ARE position sensitive and require filler to hold the charge in place. I wish Dave was still here, he could quote it off the top of his head as to which ones. Joe, if you got filler debris out of a batch of ammo and never got it before, likely that ammo maker was using what they could get during the shortage, and its characteristics called for a full case due to position sensitivity