I've wondered about accuracy with the .44 Magnums, which have or had a very long twist, about one turn in 38"!

The late Bob Wallack wrote in a book on deer rifles that he was a consultant to Marlin and had S&W rifle a Marlin barrel in .44 at the more usual twist of 1-20 or so. But an uninterested foreman at Marlin never fitted it to a test rifle and lost the barrel.

Wallack was hoping that the faster twist would produce better accuracy.