NO. I guess if we back up, first you must have the load - shot, wad, powder, the proper height, or close to it. With a 12ga that would be between 3/8 and a 1/2" of the shot to the top of the shell. I just checked my shells - .450 [ top of shot to top of the hull ] and a .055 lip on the crimp. It makes a difference what powder you're using - how dense it is. And just use enough wad pressure to seat it. Don't compress it with a lot of pressure - it'll just want to push back up latter. If the shot is too close to the top of the shell you won't have the enough shell material left over for a proper crimp. It's a learning process that you'll catch on to with a bit of experience. First get the proper height of your column of components [ bit under a 1/2" from the top ] and then work on getting a proper crimp. What are you using - powder, wad, and amount of shot in what shell ?
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Paul Harm
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