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
.308
Contact Remington Customer Service through their website.
32 ACP
UMC refers to Union Metallic Cartridge company. They are owned by Remington and only make ammunition not firearms.
22 250 Remington
2510 = 251,000%
Remington's web site has a model history section. Ammunition hard to find so value not that great. Maybe 100 or so USD
Remington stopped for a while in the 90's but they have been making it again for quite some time.
The caliber of ammunition the rifle uses is usually roll-stamped on the right side of the barrel, just in front of the receiver. For example: if it says "7mm Remington (Rem.) magnum (mag.) you would need to buy that type of ammunition as sold by Remington, Federal or any of the other companies offering this type of ammo in whichever bullet weight you prefer to shoot.
Only if it is marked ".223 Remington" on the barrel.
No. They have matching dimensions, but differ in other areas, such as neck angles. .223 ammunition can be safely fired in a 5.56x45mm chamber; 5.56x45 ammunition is not recommended to be used in a .223 Remington chamber.
Not without endangering yourself and anyone else in the area. Stay with ammunition designed for the firearm you are shooting.