I usually carry the five cartridge strips, but if I have 6 rounders, I fill all of the holes. As some have said above, you can't have too much ammo, even if it leaves one round in the strip. I load 2, 2 and 1 from them, regardless of whether they are 5 or 6 rounders. I never carry less than two reloads, be they in speed loaders or strips.

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Dave Frost