I read the 6.5 threads on Snipershide for about 6 hours a week ago and the reports were somewhere around 3200 fps with 139's and the long barrel life attributed to pressures running around 53K. I believe barrel length is 24"-26" typically.
I ran the numbers in QL and simply could not get to 3000 fps anywhere near 53K with a 22" barrel, it predicted 3037 fps at 64.7K psi.
QL estimates 3163 fps with a 139 loaded at 2.9" in a 26" barrel at 64.7K psi.
QL estimates 2981 at 53K psi with the same parameters as above.
I emailed GAP a few questions, primarily, should I get 3000 fps with 139's, I believe I said at 53K but I have to look at the email again to be sure. George G. said that pressure was hard to predict but I may get close to 3000 fps.
I am absolutely not calling anyone a liar, this was simply to see if my 300WSM would be a good candidate for a 6.5 SAUM and running the numbers. I did not want to spend the cash and end up under 3000 fps (22" barrel) and at 64K psi.
That would only be a 250 fps gain over my previous 260 with an additional 20 grains of powder and recoil.
And, using harder to find brass and prepping it.
