The heavy crimp will hold the bullet in the case a little longer so that the powder gets consumed in the cylinder and not simply light up and push the bullet part way down the barrel and the rest of the gases blow out the sides of the cylinder no longer giving presure on the bullet. Whenever I load light loads I always stand all the cases up in a loading block and visually look into every case to insure there is a charge present and also to confirm there is no double charges. Actually, I do this with all my loads just to be safe and sure. It really sounds like you may have not put powder at all in the cases (easy enough to do/see above). Primers are pretty powerful and I would think it has enough power to push a bullet at least part way down the bore. As mentioned I would go to a powder that has more bulk and tends to fill the case up a little more or possibly a slightly heavier loading. My $.02 worth
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