03-14-2022, 10:22 PM
Ok, in Grt, using the stock 6.5 Grendel model and Benchmark/ 8208 Xbr at the stated loads,
I got Benchmark: 56,108 psi and 104.3% case fill.
For Xbr, 52,674 psi and 103.5% case fill.
So stock Grt models are off by 9,000-10,000 psi as to pressure.
Interestingly enough, the Benchmark (which Grt shows as overpressure) is close to Hodgdon's MV at 2875 fps.
Xbr otoh, while over pressure slightly at 52,674 psi, shows 2883 fps, almost 100 fps faster than Hodgdon.
I got Benchmark: 56,108 psi and 104.3% case fill.
For Xbr, 52,674 psi and 103.5% case fill.
So stock Grt models are off by 9,000-10,000 psi as to pressure.
Interestingly enough, the Benchmark (which Grt shows as overpressure) is close to Hodgdon's MV at 2875 fps.
Xbr otoh, while over pressure slightly at 52,674 psi, shows 2883 fps, almost 100 fps faster than Hodgdon.
"Down the floor, out the door, Go Brandon Go!!!!!"