I think modern .405's {Ruger} twist rate is 1/14 and long heavy 400 grain bullets should stabilize.

Original 85 SS's and 95 levers were 1/32 IIRC. I am not sure long bullets would stabilize well in such a slow twist, particularly in very cold weather.

Would be interesting to see the hole shapes in a target at 300 meters on a cold day.