If I have to use copper for solid bullets and can not find existing cable, I will use the lost wax method of casting. Using wax rods close to the diameter of my bullet I’l pour thin rods. Probably about 30″ long. I hope to pull them through a die once for final sizing, more pulls if necessary. Cut the copper cable to the proper length. Then swage each bullet to create the ogive. Most likely a round nose design.