Thread: Special cases in a magnum and accuracy

I have a 44 mag that I want to load up subsonic 240 grain lead projectiles, my reloading manual has a bunch of loads but in looking at the 44 special I see that there is a far wider variety of powders that will give subsonic velocities.
Will the larger jump to the grooves ruin accuracy? or am I better off running 44 mag and picking a powder for subsonic?