I think the key to adding the over filler nitro card is to use lubed fiber cushion filler. The dry fiber fillers are hard and do not compress without a bunch of pressure. They also fly apart and can blow back into your face if the wind is right. Lubed they are softer and will compress a bit. Adding the nitro card over the filler allows for some compression and I've been getting perfect crimps since I started doing this. Also shot embedding in the fiber cuts down on the amount of shot that does the work. Much less chance of this when using a hard nitro card under the shot. Works for Cheddite, Remington and Federal hulls with both the 19 grain load of Red Dot and the load data using SR 4756.
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