I use Bianchi Speed Strips for my 642. I usually carry one in a pocket and one on my belt in a Milt Sparks 6-4C. I only load 4 rounds per strip, because I find I can reload WAY faster with that configuration. I load two rounds in the first two slots in the strip, skip a slot, and load two more. That way I can get a finger between the pairs and can pop the pairs out much faster.