Did some research on the British .303 and now I don't think this is the what you have. Here are all the markings that were used on the Military issue ammo, and how it was marked on the case is what type of round it was. It might still be a .303 but I really don't think so.
Ok here is what I have found. The round you have is most likely a 7.7x58 Jap. The Head-Stamp marking "TE" identifies the Manufacturer of the ammo as Toyo Seiki, LTD. Though I couldn't find an actual picture of one of the Head-stamps I do believe this is the what type of ammo you have. If you want to measure to make sure, here are the specs for the 7.7 Jap.
Bullet Diameter___________.313 Case Neck Diameter_______.338 Case Shoulder Diamete____.429 Case Base Diameter ______.468 Case Rim Diameter________.470 Case Rim Thickness_______.040 Case Length______________2.09 Overall Cartridge Length_____2.95 Military Bullet Weight_______175
Looks like a French 8mm Lebel rifle round(8x50R). The unusual bottle shaped case and the thick rim give it away.
The Jap 7.7 Arisaka round is rimless. Looks very similar to our .30-06Gov't round.
It isn't a .303 Brit. The case isn't shaped the same.
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