I used to use 12.0 gr of Red Dot, then a pinch of Dacron tamped over the powder, then filled the case with Cream of Wheat, and sealed the case mouth with a couple of drops of wax.
That didn't sharply fill out the shoulder, so I quit using COW and now I just use a .257 load with 75 grain bullets for plinking, and that completely fills out the AI case.
