If he had a mold I am sure he would.. but what do you want such a light one for?
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
I think Dave is exactly right. Molds are a real problem for .50 caliber conical makers - there just isn't much out there (aside from tapered minnie - maxi types) that are readily available. That means custom molds at high prices.
His 400 grainer is a modified Lyman Great Plains mold (removed the taper).