Miller, couldn't I back into that chamber pressure range using....
What means "back into that chamber pressure range"?
I'm afraid I don't understand the question or the goal. Seems you're concerned about the pressure. That imnplies you want or are interested in "lower" pressure. Any new factory ammo can reasonably be expected to be operating near the SAAMI max recommendation
unless specifically stated otherwise. There is no way to guesstimate what peak chamber pressure a load might generate from the
measured velocity and payload, much less the crude and antiquated DE term. DE is virtually useless these days in light of the fact that SAAMI specs allow a variance of +/- 90 fps from the associated average velocity. and A quick glance at any reloading manual will show you many recipes with identiacl velocities for a given payload and pressures that vary from 6,000-11,000 psi.
The only guesstimating that's justified is interpolation of velocty & pressure when everything else remains constant. Extrapolation is never justified. Even the powder companies sometimes become aware of unexpected pressure excursions and revise their data accordingly.
IF pressure concerns you at all, the ONLY way to alleviate those concerns is to test. For $15 Tom Armbrust will tell you what the pressure is.
