I just purchase a 1905 M-S and I slugged the barrel. I contacted Hawk Bullets and I placed an order for .354 RN from them. They told me the same thing ..... should be available early summer.
I have been considering purchasing this for reloading of this rifle.

http://swinglock.net/

I purchased one for drawing down .323 bullets for my .318 8mm J Simpson Suhl hunting rifle. The die is adjustable which helps if you experience "spring back" after sizing. They aren't exactly cheap but the ability to adjust the diameter saves on buying multiple dies. It also gives you a chance to experement with various bullet diameters.