I don't think so because case weight comes into the equasion as this data showsWas just wondering if there was some official number. If you make a case to the blueprint, wouldn't that work?
interesting on the muzzle break causing a pressure signature... Ever notice a tight spot in the barrel produce a bit of a pressure spike? I had that issue on my old 7stw when I had a transducer on it. Wondering if that one is a rarity or common...I have tested a couple wildcats and parent cases and multiple powders in each, after a few with doing the work of installing the test equipment, calibrating all the chambering and loading it you'll find it's really a buzz kill to learn pressure signs still show up at the same pressures, you see pressure is only one part of the equation. The most interesting thing actually was watching the reflective pressure signature from different muzzle brakes.
My thoughts also. I really don't buy into the efficiency thing but I won't use my time to argue it.There is no such thing as cartridge "efficiency" as Handloader proved several years ago with their 300 WSM vs 300 H&H test.
Roy tried to peddle this BS in the 1950s and people fell for it. They still do.
I don't think so because case weight comes into the equasion as this data shows
PPU case volume average 71.23 grains of water, 185.93 grain average empty case weight.
Remington case volume average 69.06 grains of water, 199.63 grain average empty weight.
Federal case volume average 69.46 grains of water, 206.2 grain average empty weight.
Outside dimensions of them are unknown.
You can strip a full length sizing die then run the empty case full into it, fill with water then remove it to weigh water filled case. Difference between full and empty case weight is that of the water.
If a standard volume is desired, first use case outside dimension specs to calculate a weight base using cartridge brass specs. One spec says cartridge case brass weight is .308 pound per cubic inch.
Second, subtract case weight from the base weight to get the case volume's weight if full of brass.
Third, reverse calculate the volume weight to cubic units.
If a mechanical engineer has a better way to establish a standard volume for cartridge cases, three cheers for him.
If the case volume at peak pressure is preferred, use chamber dimension specs