I like the Triad Stock Pack. Here, I keep the 4 rounds I have available to drop down in the mag as I pull the rifle out of the truck. I don't carry the ammo like this while hunting since I've had rounds work their way out while the rifle is slung over my shoulder.

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My back up rounds are carried down in the zippered pouch, inserted into a plastic ammo carried obtained in factory ammo boxes.

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Alan