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Old February 9, 2013, 05:25 PM   #18
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,017
Mehavey,

They'll need to work on the aerodynamics of that projectile a little to get it out there 100 miles, but interesting to see it's feasible.


Palmetto-Pride,

The space under the seated bullet is over twice as much in the .308 Winchester as in the .300 Blackout. That means the .308 has room for potentially twice as much stored chemical energy, whatever powders you choose from. If you assume the energy transfers to the bullet from the powder with equal efficiency in both, the .308 Win then has the potential to impart twice the kinetic energy to the bullet. Kinetic energy is proportional to the square of velocity, and the square root of 2 is 1.4, so the .308 has the potential to produce 1.4 times as much velocity in the same weight bullet that the .300 Blackout does. In real life the efficiencies aren't identical and the .308 has a higher peak pressure spec, but still, the 1.4:1 velocity ratio isn't far off the mark.

If you formulate some kind of super powder for the .300 Blackout, then you can do the same for the .308 and you will still come back to that roughly 1.4:1 velocity difference.
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