Where can you find Remington 25-10 ammunition?

Try Old Western Scrounger at 1-304-262-9870. The ammunition itself was discontinued in 1942 and is more commonly called the 25 Steven. It was also known as the 25-10 because it was a 25 caliber 67 grain bullet loaded with 10 grains of blackpowder. It was soon obsoleted with the introduction of the 22 magnum which was cheaper and more powerful. If Scrounger can't help then I guess your only option would be to find a antique ammunition dealer maybe at a gun show. Hope this helps....Steve