Copper Solvent

[DeadEyeDeadly]

What I surmise from the info that you have provided, is that determining high pressure loads is a crap shoot without sophisticated diagnostic test equipment. I checked my data base and found that I had chronographed the 6.5 Creedmoor load in question. Perhaps you can make an educated guess as to what pressure I might be running? Here are the specifics:

Rifle – Savage Target Action, McGowen 28 “ SS Heavy Barrel (Douglas # 9 Contour)
Case – Nosler
Primer – WLR
Bullet – 120 gr Sierra MatchKing HPBT
Powder – IMR 4451: 44.2 grs.
Velocity – 3102 fps

Thanks for the input!

[darkker]

I'm not sure if that is a progressive powder or not, that REALLY throws a monkey wrench into things... The fact that there is relatively little split, makes me suspect it could be. Progressives are a whole different ball of wax, as their burning curve changes rather dramatically with operating pressure, whereas the velocity doesn't much; at least not like a conventional powder.
The Creedmoor is much like the 308, in that barrel length really doesn't matter as much as many wish it would.
For a reference, read here:
http://rifleshooter.com/2016/02/6-5-...p-a-creedmoor/

Really would need some PT data for that powder, but it is currently in Az.
For a W.A.G. that is based upon that being a linear burn, puts you in the 65-68,000 psi range.