I reloaded and shot my first batch of ammo for this barrel. The barrel is an Eabco 26" .223, with a 12" twist. The 12" twist is supposed to be good for 40-50gr bullets. I loaded Sierra 45gr spitzers, Hornady 45gr Hornets, and Winchester 46gr HP's. I used H335 for all. I loaded 4 different weights of powder for each bullet. Starting about a medium pressure and moving up towards the max listing.
The first bullets fired were the Sierras, nothing to brag about, not very good honestly. But the first Hornady fired went throught the target sideways! Out of 20 rounds fired, 8 were tumbling when they hit the target! What's the deal?
Am I pushing them to fast with a mid range charge, to slow? I would expect this from a 70gr bullet, but not a 45. Oh, yes, I meassured the twist at 12" with a cleaning rod and tight patch. Any ideas? Opinions?