Now that Aguila is manufacturing this obsolete ammo again, I cleaned up my uncle's old rifle and took it out. It cycles perfectly and is great fun. Based on my rifle's serial number, it was manufactured in 1905 - so it's 112 years old. Those old Winchester 1903 automatics are great. With the availability of ammo, I wonder if the Model 1903's value will increase? Checking the usual auction sites, it doesn't appear so, at least yet. The newly manufactured ammo is available from the various Internet ammo sites. They are getting about $17.50 per box of 50 (plus shipping). The last old, vintage box I bought at a gun show was $25, and that was about 8 years ago.