Unless you have actual pressure testing equipment, one can only guess what the pressure is doing.
I think anyone getting 2900fps out of a 6.5x47 with a 140 is waiting for a kaboom. Those are 6.5-284 speeds. From Hodgdon:
140 GR. SPR GS-SP Hodgdon H1000 .264" 2.910" 49.0 2503 53.5C 2694
140 GR. SPR GS-SP IMR IMR 7828 SSC .264" 2.910" 45.0 2462 50.5 2718
140 GR. SPR GS-SP Winchester Supreme 780 .264" 2.910" 48.6 2606 51.7 2797
140 GR. SPR GS-SP Hodgdon H4831 .264" 2.910" 45.0 2520 49.5 2722
140 GR. SPR GS-SP Hodgdon Hybrid 100V .264" 2.910" 45.0 2696 49.0 2895
140 GR. SPR GS-SP IMR IMR 4831 .264" 2.910" 43.0 2536 47.8 2762
140 GR. SPR GS-SP Hodgdon H4350 .264" 2.910" 42.0 2548 45.5 2720
140 GR. SPR GS-SP IMR IMR 4350 .264" 2.910" 42.0 2539 46.8 2753
You are correct, I get 3000 fps with 130s using 50.5 grains of R17. I am using Lapua brass. If you are getting those velocities out of a 6.5x47 you are certainly dancing with 75,000 psi. BR shooters do it all the time. They have extremely tight tolerances on everything- doesn't mean it's safe.
I can't get 2900 with a 260 AI using R17. Are they doing it? I won't say they aren't but their pressures are way over the top. You are testing the yield strength of the action. If you want those velocities, use a 6.5-284.
