Originally Posted by
gimp
We're talking a 22" .260 here though, not 12”....
But on the subject,
Tussock cut his 6.5x47 from 26" to 22" with loss of 10fps. His load of 42gr was exactly the same as mine (my load development initially consisted of pinching ammo from his shed when I was in a hurry) and doing about 2fps different average out of my 20” to his 22”
We got nearly 2900fps from a 20" barrelled BSA 6.5x55 back in 2009 with N560 when we got snowed in and had nothing better to do, without any real pressure signs
Norway has a 18.5" 6.5-284 and enjoys it - although he is very conservative with his loading compared to all of us.