Its friday- barrel length comparison

[rustyshackleford]

This might help: https://rifleshooter.com/2014/12/30...ato-barrel-length-versus-velocity-28-to-16-5/

I think the point of the thread was to compare the cartridges. As in "Is a 16" 300 wsm just a 24" 308?" and on.

 

[Muddyboots]

MGM barrels did a barrel cut down on 6.5CM and 280 AI plus 5 others that is interesting. On Encores but still somewhat relative.

Velocity Testing – Thompson Center Barrels – Match Grade Machine

matchgrademachine.com

 

[GLTaylor]

Historically, the anticipated difference in barrel lengths speed has been credited at 20-25 fps per inch. Now, don't ask me where that reference is. Just a recollection from 50+ yrs handloading?

 

[UncleDano]

Historically, the anticipated difference in barrel lengths speed has been credited at 20-25 fps per inch. Now, don't ask me where that reference is. Just a recollection from 50+ yrs handloading?

Yes, this is what I remember also, but from where I can't remember - it has been too long ago. Starting with a 27" barrel and working down to 16", the average loss in velocity per inch, was approx. 25 fps plus/minus. This was true for several calibers.

 

[rustyshackleford]

Yes, this is what I remember also, but from where I can't remember - it has been too long ago. Starting with a 27" barrel and working down to 16", the average loss in velocity per inch, was approx. 25 fps plus/minus. This was true for several calibers.

I'd think that's kind of like testing powders though. From 27-21" maybe it was less than from 21-16". With most powders they are pretty stable between 45 and 75 degrees. But move that window of 30 to 45-15 or from 75 to 105 you averages will be very different.