How barrel length affects velocity ...

[FEENIX]

For what it is worth ...



I have seen a few, but this is the first time I've run into this video. I thought it was informational. Sorry, it was previously posted.

Ed

 

[Quintus]

I have seen a couple of these and have found them to be pretty consistent. I read one that was done with a cartridge that was quite over bore and I think they started with 30 or 32 inches of barrel and they cut it back to 20" if I remember correctly. I wish I had saved the article for the specific data, but it made me want a 30" 257Wby in the worst way!

 

[FEENIX]

I have seen a couple of these and have found them to be pretty consistent. I read one that was done with a cartridge that was quite over bore and I think they started with 30 or 32 inches of barrel and they cut it back to 20" if I remember correctly. I wish I had saved the article for the specific data, but it made me want a 30" 257Wby in the worst way!

Yep, I remember that but I too did not save the link. Here's another ...

 

[Hunterjones]

I remember reading an article about 15-20 years ago by I believe it was John Barsness. He ran the same test with a "standard" caliber like 30'06 or .257 Roberts and velocity either did not change or got slightly faster from 30" to 18". It was quite interesting and an anomaly I'm sure....

 

[YZ-80]

Interesting and useful information. Thanks for posting. I particularly like his "rip-cord"laboratory test set up.

 

[243winxb]

Looks like the longer barrel may make better use of unburn powder?


https://apps.dtic.mil/sti/pdfs/ADA472269.pdf See - 6 Conclusions

Propellant consumption efficiency, illustrated by the percent of
unburned energetics compared to the original constituent load, ranges
from 0.56% to 5.4%.

 

[J E Custom]

Dan Lilja did an article on this that was very well thought out an executed.

Here is the link.

Barrel Lengths in the 338/378 Weatherby Magnum - Lilja

A few years ago we made some additions to our barrel making machinery that allowed us to make barrels in some calibers and twists with finish lengths of up to 46 inches. One of the first calibers we added in these extra-long barrels was the .338 and in a 10″ twist rate. During the initial...

riflebarrels.com

J E CUSTOM