I make sure all my 44mag cases are trimmed to the same length. They will stretch with heavy loads.
I do not crimp for my contender but do crimp in my Redhawk.
In checking the velocities with a chronograph, in the Contender, my largest spread was only around 20fps with non-crimped loads. That is nothing when shooting 315gr. cast bullets that avg. 1850fps.
Crimping is normally done to eliminate bullet jump in the cylinder of revolvers between shots. Single shots, you don't need to worry about bullet jump.
HBL