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Powder burn rates have much to do with how well a platform suppresses. If you have gasses in excess of what is needed to cycle action it will add noise. Being a reloader makes it easier to hone in on a load that is quiet but trying many different brands of subsonic ammo will probably get you there also. I load a 500gr subsonic load for my 458 socom and it is only slightly louder than my 300blk loads. It took many range sessions with 4-5 different powders to arrive at it but well worth the effort. The ultimate quiet subsonic rig is a bolt action or a single shot but the correct burn rate powder can effect their noise level as well.