I loaded some lyman 525 slugs in the fed gold metal hulls with waa12 substitute from claybusters with 31.5 grains of x800. The wad and the slugs seemed to seat with very light pressure. when I seated the wad deep enough on top of the powder to keep it from being able to shake around the slug was about 1/4 inch below the point of where the fold crimp would be flat. Do I have to seat the wad tight down on the powder to keep a pressure spike? The load does not call for it but can I put some cork disks or nitro cards on top of the slug? thanks