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Per Ardua Ad Astra
The old Mk7 303 ball ammunition introduced in 1910 was one of the most deadly type ever issued to any army. The bullet or projectile was constructed so that the front 3rd of the bullet was filled with a lighter material such as aluminium, and the rear 2/3rd lead. In flight the bullet was stable, but as soon as the bullet hit tissue it tumbled causing massive wounding. Although the round was legal as far as the Hague Convention was concerned, it really didn't comply with the spirit of the convention.