Fishing sinker and then crimped closed. This feature makes adding and removing the weights easy and quick. Bullet sinkers are bullet-shaped and used widely on largemouth bass fishing for rigging plastic worms "Texas-style". Dipsey sinkers are ovate or egg-shaped and are attached to the fishing line with a loop of brass wire embedded in the sinker. Bank sinkers are long and ovate and have a small hole at the top for the fishing line to thread through. A claw sinker consists of a sinker weight which is typically of round shape, and a number of metal wire spikes grouped around the sinker
Hollow-base bullet developing a hollow-base bullet was to improve utility of muzzleloaded blackpowder rifles. Hollow-base bullet A hollow-base bullet is an expanding bullet that has a pit or hollowed out shape in its base often intended to cause the bullet to expand upon firing a cartridge in order to expand the base against the barrel grooves and obturate the bullet more as it travels through the barrel. It is also used for improved aerodynamic stability and accuracy as hollow-base bullets are usually front-weighted which enhances their aerodynamic stability. Two men have been credited of the invention of the hollow-base bullet: Captain Claude-Étienne