KJS
Member
Looking at muzzle energy favors bullets that are lighter & faster, like a 125 gr .357 Mag.
Looking at power factor favors bullets that are heavy, even if slow.
Using a balistics chart for some ammo Remington makes:
357 Magnum: 125 gr @ 1,450 ft/sec = 583 ft-lbs of energy
45 Auto: 230 gr @ 835 ft/sec = 356 ft-lbs of energy
Based on muzzle energy the 357 is the clear winner.
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Yet I've read about power factor, so let's look at that:
375: 125 x 1,450/1,000 = 181 power factor
45 Auto: 230 x 835/1,000 = 192 power factor
So now the big slow .45 is the winner by that measure.
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Now for the question: what's the true measure?
Looking at power factor favors bullets that are heavy, even if slow.
Using a balistics chart for some ammo Remington makes:
357 Magnum: 125 gr @ 1,450 ft/sec = 583 ft-lbs of energy
45 Auto: 230 gr @ 835 ft/sec = 356 ft-lbs of energy
Based on muzzle energy the 357 is the clear winner.
-----------------------------------------------------------
Yet I've read about power factor, so let's look at that:
375: 125 x 1,450/1,000 = 181 power factor
45 Auto: 230 x 835/1,000 = 192 power factor
So now the big slow .45 is the winner by that measure.
------------------------------------------------------------
Now for the question: what's the true measure?