10 mm Rebranding

[Mike_Fontenot]

[...]
In general the SAAMI MPLM will be no more than 2.5% higher than the MAP.  In addition, the standard allows for MPSM of 6.3% over the MAP, [...]
[...]

Thanks for that post ... very useful and informative.

I don't think you specifically defined MPSM ... what does the acronym stand for?  Maybe "max pressure small_lot"?  From your example, I THINK the definition must be "max pressure averaged over any group of 10" ... is that right?

I also noticed that, in your examples, that the max force on a .45ACP bullet, vs the max force on a 9mm bullet, when each of them are right at their spec max pressure, is slightly less for the .45ACP.  I continue to be perplexed about the fact that .45ACP is widely regarded as being much superior in "single-shot-stops" than 9mm.  Assuming that that perception is correct, it would seem to be possible only if the .45ACP bullet experiences a much higher AVERAGE force in its complete travel down the barrel, even though the max pressure is slightly less.  That conjecture is based on "single-shot-stops" being largely correlated with muzzle energy, but maybe that's not true.  (The reputation of .45ACP even goes farther: many people regard the .45ACP as a better "stopper" than .40S&W, and that's even harder for me to understand).

[The_Shadow]

Mike the SAAMI data is found in Publication 205...

Pressure testing info...
http://www.saami.org/specifications_and_information/publications/download/205.pdf

Example of 205 10mm pressure MAP
The specific loads of the test have to fit the MAP set by SAAMI.

Here is a typical MAP as set by SAAMI for the 10mm Cartridge;
Nominal Mean Instrument @ 15 feet with =/-90 fps from test barrel
Maximum Average pressure MAP of 35700 psi
Maximum Portable Lot Mean MPLM of 38700 psi
Maximum Portable Sample Mean MPSM of 40500 psi

The ammunition in test (10 rounds) would need to fit this established profile.

Nothing in the sample over 40500 psi

[DenStinett]

I M H O...
If there was to be a .40Mag, wouldn't it make more sense to call the "Small Primed" 10mm the ".40Mag" ?
As IT has more in common with the .40 S&W

[P33v3]

Quite frankly if there was a rename the from a Marketing standpoint the .40 Magnum probably would draw a lot more attention. Not saying I like it but if it meant cheaper and more plentiful ammo and ammo choices, I'd be OK with it.