07-24-2021, 08:28 PM
(07-24-2021, 03:16 PM)Old Bob Wrote: 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...Cooler weather in SE La this time of year??? Was thinking as they were hot, they would lengthen a little more. The bullets are not in the lands and it was a clean bore. They are .015" off. I measured them. The first 6 I shot, a few weeks ago, I did not have the chrono on. Just trying out on my 50 yard range out back to get the scope sited in a little. I think these things are just hot to begin with. I somewhere they are compressed loads. I did some 105 Barnes MBs and hit 2815 with 29.1 gr of LVR and they were .015" off the lands. They grouped way better than Blacks. Load was not even close to compressed but on the edge due to slight ejector marks and the BR41 primers were starting to flatten. I think they were running a little hot and backing them back down to 28.8gr for accuracy testing. I am pretty much decided to pull the blacks and downgrade the charge. I weighed the charge on one I had pulled to test the CBTO and it was a little over 30grs. May have to drop it back down to 29. Hmmm. I will post the results.