07-24-2021, 03:16 PM
The fact that your Hornady Black cases are longer than your Starline cases, and along with flattened primers, it sure sounds like they were runnin' hot. Have you shot the same ammo in cooler weather with lower pressure signs? What's the CBTO length of your Hornady Black cases? Could the bullets be going up into the barrel lands? IIRC, there was an issue with the first batches of Hornady ammo jamming into the lands. Newer batches have a shorter CBTO...
The trick is growing up without growing old. -- Casey Stengal