Excellent practical research, thanks for your efforts.

I have used Hawk Bullets-(Glenrock, WY-now HawksBridge,NJ)
They perform like Woodleighs but have a variety of weights.
Handloader Magazine thinks highly of them. Another source
for bonded 250 gr bullets is Alaska Bullet Works in Juneau.

I have two(2) early Model 71 rifles in 348 Ackley Improved.
It actually delivers close to 200 FPS more than the parent
348 WCF. J. Kronfeld did an article on this cartridge for Handloader.

Its very similar to a 35 Whelen in a lever action M-71. Recoil is
not that objectionable- in Alaska. Used a 270 gr Hawk bullet to
stop a large interior moose at 90 yards. Nice to have in bear country.LtCol RM

"The credit belongs to the man who is actually in the arena-not the critic"-T. Roosevelt
There are no atheists in fox holes or in the open doors of a para's aircraft.....