Carpediem4570. ADI powders are made in Australia and import to the USA by Hogdon I believe. Their H4350 is equivelent to 2209. I do not think it interchangable, so take care and work up gradually. I do the initial sighting in over a benth rest until I find a load that regulates. Take care that your hand on the foreend is between the fore end and the pad/sand bag. After I find the load that works I then resight it standing over a rest. Generally I find that offhand, it will shoot about 2" lower than what it did from the bench.