 However, jacketed bullets had been in use since at least 1882, over a decade prior to the Hague Convention.By design, fully jacketed projectiles have less capacity to expand after contact with the target than a hollow-point projectile.While this can be an advantage when engaging targets behind cover, it can also be a disadvantage as an FMJ bullet may pierce completely through a target, leading to less severe wounding, and possibly failing to disable the target.