barrel length and velocity

[Tokimini]

I believe most load data is usually configured using a 24" barrel. I have a 28" McGowen barrel on my 6BR. I was wondering if anyone knew approximately how much additional velocity that extra 4 inches of barrel would give me. I'm using 105 gr Hornady Match and 28.5 gr of Varget.

Thanks

 

[hunter243sgk]

If you go to gunnersden.com they give a good break down per inch.Hope this helps!!

 

[Dgd6mm]

75-85 fps.

 

[stool]

and just remember,,,,,,
all bbls are different........

 

[Switchbarrel]

Sorta-kinda related-

You probably used the search & found this already, but just in case...

http://bulletin.accurateshooter.com/2011/12/barrel-length-and-velocity-barrel-cut-down-tests/

-and this, scroll down a little bit to Feb. 7,

http://www.6mmbr.com/BlogFeb2006.html

-Rick

 

[243DH]

I had a 28" 8 twist 6 br criterion barrel cut down to 22". Load was a 108 berger with 29.0 gr h4895, it ran 2840 in 28" barrel. After cutting back to 22" that same load was running 2806. Both speeds were verified at 1k. I don't think that the 6 br gains/loses as much per inch as larger case capacity cartridges.