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Unread 04-04-2017, 01:19 PM   #1
Chickenthief
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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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Unread 04-04-2017, 01:46 PM   #2
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Quote:
Originally Posted by Chickenthief View Post
As you can see the gain for each inch is decreasing.
From your figures, I would say it is increasing...
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Unread 04-04-2017, 02:10 PM   #3
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Quote:
Originally Posted by sheepherder View Post
From your figures, I would say it is increasing...
Yes and do
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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Unread 04-04-2017, 02:45 PM   #4
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Ah, I get your point now. 2nd derivative.
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