Jorg, I had the same question. 50,000 PSI is about the reasonable maximum in most modern assault rifles. Grendel specifically warns users about hot loads in the AR platform.
Nolo, Can you give me exact dimension on your cases? I'll runs them through QuickLoad. In the 6.5x50 round I worked on a couple of years ago, with a water capacity of 37 gn H2O, the best I could do was 2775 fps with 45,000 PSI
The 6.5x47 Firebrand shows a case head size of 10.3mm, or 0.403 inches - which is between 223 (0.383)and 6.8 (0.422). My own 6.5x50 uses a 0.452 casehead and in order to make 3000 fps using requires a chamber pressure of 66,000psi. The 6.5x47 Firbrand would have less case capacity so the pressure must be higher, likely into the 70,000 psi range.
Nolo, Can you give me exact dimension on your cases? I'll runs them through QuickLoad. In the 6.5x50 round I worked on a couple of years ago, with a water capacity of 37 gn H2O, the best I could do was 2775 fps with 45,000 PSI
The 6.5x47 Firebrand shows a case head size of 10.3mm, or 0.403 inches - which is between 223 (0.383)and 6.8 (0.422). My own 6.5x50 uses a 0.452 casehead and in order to make 3000 fps using requires a chamber pressure of 66,000psi. The 6.5x47 Firbrand would have less case capacity so the pressure must be higher, likely into the 70,000 psi range.