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Since you say that the ammunition is still in the CHARGERS, we can probably assume that the belt you refer to is a leather bandolier. There should be a name printed or stamped on the leather, most likely near the buckle end.
There are several types of British bandoliers that held the five round Lee Enfield chargers. Some are 5 pocket, some 7 pocket and some 9 pocket. There were even bandoliers designed to fit over a horse's neck for Cavalry use. Depending upon the type, and the markings, (there may even be Regimental or Unit markings on it), the bandolier, if in decent shape, is an average of $50 to $100.
I would not fire the Ammunition. Depending upon Headstamps, it could be worth some money. If you want something to fire, then trade it to a Cartridge Collector for modern stuff.
The other thing you have is the Chargers. Some of this ammunition was packed in the older Mark II chargers, and these are worth more than the later ones to a Collector. These chargers usually have slots on the back of them, instead of holes.
Pictures and a bit more detailed description are needed. For example, is the bandolier made of leather or cloth?
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