It would be cool if they would make a faster twist 6ppc it would be a nice repeater. Why don't they? It's a niche that needs to be filled unlike a lot of new cartridges. There's also already the 6ar which is nearly the same as the arc. I don't want to blast all that powder out of a 243 just to launch a 6mm
The arc is a fast twist ppc plus .030 at the shoulder
Threaded Mode
