gmsemel,
Chub and I built a rifle each in the cartridge: both were 6.5-280 Ackley Improved. Chub's is marked 6.5 Blowhole Express and mine was maked .264 Brainfart Express (we share a weird humor
).
I later gravitated to the 6.5-'06 Ackley Improved, mostly because the dies were quite standard and great brass was much more plentiful. I had Gordy Gritters make the rifle using a Krieger barrel, McSwirley RemClassic stock and bushed bolt.
The 6.5-280 Ackley offers slightly increased powder capacity, but the 6.5-06 Ackley Improved is still probably the most practical large .264" hunting cartridge for those who want the most performance with the least recoil.
I wrote a two-part article on the Gordy Gun and the 6.5-'06 Ackley. Heck of a cartridge.
