A good friend of mine who is not a reloader has a nice rifle (Winchester M70) that was originally chambered in .257 Roberts, but he had it reamed out to .257 Ackley Improved. He has had it for years and as never had a good source for ammo. I am going to work up a load for him, probably using Barnes 100 gr. TSX boat tails. The Barnes manual show loads up to 3200 fps which is impressive, and will likely make a good white tail load. I understand that typically, .257 AI brass is fire formed by shooting .257 Roberts loads in an AI chamber. In the interest or moving things along, I'd like to buy some .257 AI brass already formed. Does anyone know of a source for such? Thanks.