I don't think that bullets heavier than the standard 240gr. are necessarily superior in the 44 Mag. I have a 2 5/8" 629 and use 300gr CastPerformance bullets in it exclusively. I found them to be accurate and I'm not trying to push them real fast out of that short barrel, nor am I hunting with it or using it for long-range shots. I just wanted a flat, heavy hunk of lead that might offer some slap at close range. I haven't tried the CP 320s yet, but might have to see what they 'feel' like. Mostly I'm just having fun.