S2in470,

I'm not sure you'll need filler wads. I am mucking around with my 470 at the moment and find 105g of AR2209 (which is sold by Hogdon's as H4350) fills to just below the bullet base giving 2150-2180 and 112g of AR2213SC (H4831) fills to the bullet base (I haven't fired this load yet).

These powders are supposed to be very stable across a wide range of temps and with the AR2209 last weekend I fired two shots with the rifle as it came out of the house (say at 60F) and then after leaving it lying in the midday sun - I had to hold it with a towel to shoot it as the barrels were so hot (say 108F) and there was no difference in velocity. Not an extensive test, but reassuring.

mike