barrel lengths for 6BR

[warner]

Not sure if this has been visited before, but here goes anyway. Since I do not shoot this cartridge myself, I am looking to the shooting populace. I am trying to gather some data on the above in hopes to avoid slower velocities. Thus, I am looking for general max velocities out of a 6BR, using the 105/107/108 grain bullets, in a 28', 30', and 32' length barrels. The end question: Is there enough powder capacity in the 6BR to keep burning in the longer lengths? Sure the bullet will have enough to escape the barrel, but will it be slowing down at that length?
I speculate that it is all done at about 28', but I have no proof. Has anyone tried this experiment? What were your results?

 

[GermanS1]

The 6BR still has enough gas pressure at 30' to add velocity. I have several with that barrel length. Someone with Quickload might be able to calculate when gas pressure would be overcome by bore friction, I suspect it would be well past 40' of barrel length.

You might enjoy this piece on cutting down a 6BR barrel: http://www.6mmbr.com/BlogJan2006.html