Caliber Questions

>>33384370
Because kinetic energy is one half the mass times the velocity squared and for every action there is an equal and/or opposite reaction.

This means the .40 will be sending the slide/barrel/upper assembly shit backwards faster.

The slide assembly going back faster also means more recoil because more velocity for the equation with the slide assembly.

And you also have to consider that they are usually the same size/weight as a 9mm which means all the extra kinetic energy you now have is being distributed over the same area in your hand as the 9mm kinetic energy.

>>33384479
OOOOHHH I see. OK then that makes sense.

>>33384370
Different powders feel different also. Even if you load a .45 with same bullet and same fps. Powders have different burn rates.

>>33387172
Thank you for this, I forgot to include burn rate and case capacity in
>>33384479

Those will also effect felt recoil as 5kg per square inch (just random ass measurements off the top of my head) over .02 seconds is much harder than the same thing over .05 seconds.

>>33387172
>>33387341
But if the powder burns faster that would result in a higher case mouth pressure right? I tried to eliminate that variable by saying that the rounds we were comparing all maxed out the case mouth pressure.

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Also, before the thread dies...

fucking 9mm, 9mm +P, 9mm +P+, 9mm Nato...
From what I've gathered here is the approximate pressures.

9mm <35,000psi
9mm +P <38,500psi
9mm +P+ >38,000psi
9mm Nato 38,500-42,000psi
Now nato is peculiar, because every military will specify more precise parameters for their countries ammunition, but the Nato standard is just to make all of the individual loads produced per the different contracts within a certain range, so that there is at least some interchangeability and one country doesnt produce super hot or super under pressured rounds right? I've heard from range coaches that the USMC uses the equivalent of 9mm 124g +P.

Is a 9mm nato case the same as a 9mm or 9mm +P case? Can I put +P in a non NATO case if I am reloading?

>>33389672
Your NATO pressures are way off. Should be midway between +p and regular.

>>33389721
oops, I've been reading forum posts and I can't seem to find a credible source.

You wouldn't happen to know if the cases are all the same?

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>>33389721
http://gigconceptsinc.com/files/STANAG4090-cartridge_9x19.pdf

Whats radial copper?

>>33389672
real fucking nato

So wait: 9mm NATO has a higher maximum chamber pressure than .50 AE (36,000 psi)?

>>33394519
look up the PSI on the various 5.7x28 loads - PSI is not a direct metric for power