Is 303 inch cartridge GB 53 7 collectible?

The .303 cartridge is the standard caliber for the English made Enfields. the other GB 53 7 stands for where and when it was made. These are military designations. Commercial ammuntion would have the .303 caliber stamped on the bottom of the casing along with either the name or initials of the company manufacturing the bullet. The caliber was used by the English for many years including World War II. Most of the NATO nations now use the American .223 caliber in the M14 - M15 - M16. The cartridge can be a collectible however it's value is low in the cartridge collections of today. It is a nice military collectible. Captain Bob