My mother-in-law gave me her deceased husband's old 303. It's pretty old and has been restocked (Company name indicates London manufacture, 1940-something, but I've been told some a crest on it indicates Indian manufacture. Who knows?). She also gave me a bag of old ammo. A few shells are stamped "1944" on them. Any risk of firing them, either due to the condition of the shells themselves (they look OK, but I have no idea how they have been stored), or the rifle?