:? hmmmmmm, i feel like my 14" 44mag with 240's kicks, and twists more than my 15" 7-08.
funny how people are different. :-)
trajectory, and shooter ability are the biggest limiting factors i think. i'd guess 150 yards under the most ideal shooting situation, with known trajectory, and practice.....and agree with chris that 100-125 yards would be a more safe limit.