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04-04-2017, 01:19 PM
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#1 |
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Here is some calculated numbers using Quickload:
Bullet: Hornady 124gr FMJ RN Powder: Unique 5.0grains Calulated max pressure: 31.5kpsi with full burn in a 4" barrel. 4" barrel: 1141fps 5" barrel: 1196fps 6" barrel: 1238fps 7" barrel: 1270fps 8" barrel: 1296fps So it seems that there are indeed more power in a 9mm from a longer barrel. As you can see the gain for each inch is decreasing. |
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04-04-2017, 01:46 PM
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#2 | |
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Lifer
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Quote:
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04-04-2017, 02:10 PM
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#3 | |
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Quote:
Yes there is an inrease in speed but the growth/gain in speed dereases. From 4" to 5" the gain is 1196fps-1141fps = 55 fps 5 to 6 = 42fps 6 to 7 = 32fps 7 to 8 = 26fps So you see that each additional inch adds less speed to the total. So the growth is decreasing ;-) |
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04-04-2017, 02:45 PM
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#4 |
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Lifer
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Ah, I get your point now. 2nd derivative.
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I like my coffee the way I like my women... ...Cold and bitter...
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