I haven't had any experiance with the 44mag. But I did stay at a Holiday Inn Express last night...
I would think a simple answer to these oversized bores is to first slug it and determine the actual "caliber" you are working with. Then get a LEE double cavity mold closest to the diameter. Have someone to "open up" the mold to .004"-.002" over that of the bore. Cast and then size the bullets in a LEE sizer that has been open upped also.
Granted, the damn thing should need this. But sometimes you got to work with whats been given to you.
Also, A LEE UNIVERSAL CASE EXPANDER helps in getting the larger and cast bullets into the cases.
I don't mean to sound like a LEE spokemans, but I haven't seen anything else match their products and price.
Lefty