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15-04-2024, 17:35 #1
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Barrel Length vs Velocity. Some practical examples.
I recently had the barrels of two hunting rifles shortened which gave me the opportunity to actually measure the difference in velocity between barrel lengths in the same rifle with the same load.
7x57
130gr Peregrine VRG4
48.5gr IMR4350
Velocity 22" barrel: 2757fps.
Velocity 20" Barrel: 2714fps
Difference in velocity: 43fps
Average velocity loss per inch: 21.5fps
6.5 Creedmoor
143gr ELD-x
39.5gr S365
Velocity 24" barrel: 2590fps
Velocity 18" barrel: 2450fps
Difference in velocity: 140fps
Average velocity loss per inch: 23.3fps
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15-04-2024, 18:55 #2
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Re: Barrel Length vs Velocity. Some practical examples.
Thats good confirmation of the 25fps/inch rule of thumb...
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16-04-2024, 06:46 #3
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Re: Barrel Length vs Velocity. Some practical examples.
If you want more examples, google "Ballistics by the inch".
They have cut down a fair variety of calibers incrementally and recorded the results.
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16-04-2024, 06:49 #4
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16-04-2024, 08:11 #5
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Re: Barrel Length vs Velocity. Some practical examples.
Thanks TStone. Why did you cut them down as a matter of interest?
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16-04-2024, 08:52 #6
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Re: Barrel Length vs Velocity. Some practical examples.
I recently had the barrels of two hunting rifles shortened which gave me the opportunity to actually measure the difference in velocity between barrel lengths in the same rifle with the same load.Last edited by TStone; 16-04-2024 at 13:38.
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16-04-2024, 13:35 #7
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16-04-2024, 16:28 #8
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17-04-2024, 08:07 #9
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17-04-2024, 18:00 #10
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Re: Barrel Length vs Velocity. Some practical examples.
Decided to send a PM instead.
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