I was shooting this weekend with a new to me Taurus Raging Bull in 454 Casull.
First off I have handloaded my own ammunition for many years but I have never had powder unburnt in the case other than the occasional few flakes. I had been shooting some Accurate No.9 with Sierra 300 grain bullets. I know they are the forsaken J-words but just was trying some out. All previous rounds were perfectly fine. My shooting session ended early due to a squib load.
The load I was using was out of the Sierra manual and I was using Winchester Small Rifle primers. These were loaded one at a time and weighed individually in New Starline Brass. Good news is that nobody was hurt and I was able to tap the bullet back out and everything looks fine. The following pictures are of the empty casing and the clumpy powder. I am hoping that maybe you guys have some idea as to what might have happened. Bad primer? Bad powder?