My experience has been that CCI, the Mini-Mags for preference, are the easiest-to-digest for almost any gun. When I can get them, I usually shoot M-Ms for the first few hundred rounds as a sort of a "break-in" period (not all guns require them), then try other things. The problem is, since the onset of the madness Mini-Mags have been very hard to get and very expensive. If I can't find them, my preference is for CCI standard velocity, Fiocchi and Aguila.