Don't give up on the 311284 too soon, you're not easily going to find the B&M mould. Try 14 or 15gr of Blue Dot under the 311284, and use a magnum primer. Seat the boolit out to touch the rifling. Cast of WW should be ok. Most important thing is to slug the bore of your Kragicon. Most of mine are .310 groove diameter and I size bullets to .311. What ranges are you shooting in these matches?