I've been loading and shooting a lot of .44/40 recently as I'm trying to find a good load for my Uberti '73 .

The current load is 13.5 gr of 2400 using either my own cast bullets or Kranks .44 mag bullets and previously Winchester primers.

Getting low on primers however, I bought 600 CCI Large Pistol Primers No.300 from my local gun shop and loaded 50 rounds to shoot yesterday.

It was disaster from the outset though, a few rounds working as they should be mostly feeling underpowered leaving unburned powder in the case and up the barrel. Seemingly the primers had been blowing the powder out of the case without igniting it. I unloaded a few this morning but couldn't see anything amiss.

Primer or powder problem?

Steve.