Joec7651
Handloader
- Apr 7, 2019
- 944
- 1,218
The concerns mentioned below are not small concerns. I’ll let others beta test an experimental cartridge with the rifle bolt 3 inches from their face. Keep stuffing 10 lbs of sh@t in a 5 lb bag and the bag will split. Not can, will. I sincerely hope I’m wrong and just being negative. I don’t want to see anyone hurt. The statements below are from the article and are not my words or work.
“Even with the rifles I’ve tested so far I’ve noticed something that supports this concern: increased bolt lift during primary extraction. I put five-shot strings through the rifles while gathering accuracy data, and it wasn’t uncommon for the bolt lift during primary extraction to get heavier after the fourth or fifth shot, sometimes requiring a knock with my hand on the underside of the bolt knob to overcome the resistance.
I know that RCBS is working on reloading dies for the 7 BC, and I’m eager to try them. But from what I’ve heard from RCBS, the dies are having trouble resizing the cases. In order to get them back to their original factory size they need to be run through the die multiple times — more than a dozen cycles, in fact.
According to Federal, the steel alloy cannot be annealed, which means that the cases will probably get brittle after a handful of firings. At that point I’m assuming they’ll exhibit cracked necks or shoulders and need to be pitched. I say, “I assume,” because I haven’t been able to test this myself. This is based on what Federal’s engineers have said.”
“Even with the rifles I’ve tested so far I’ve noticed something that supports this concern: increased bolt lift during primary extraction. I put five-shot strings through the rifles while gathering accuracy data, and it wasn’t uncommon for the bolt lift during primary extraction to get heavier after the fourth or fifth shot, sometimes requiring a knock with my hand on the underside of the bolt knob to overcome the resistance.
I know that RCBS is working on reloading dies for the 7 BC, and I’m eager to try them. But from what I’ve heard from RCBS, the dies are having trouble resizing the cases. In order to get them back to their original factory size they need to be run through the die multiple times — more than a dozen cycles, in fact.
According to Federal, the steel alloy cannot be annealed, which means that the cases will probably get brittle after a handful of firings. At that point I’m assuming they’ll exhibit cracked necks or shoulders and need to be pitched. I say, “I assume,” because I haven’t been able to test this myself. This is based on what Federal’s engineers have said.”
