such bullets are easily made if you have access to a lathe. the little $250 (used) Chinese lathes suffice, and you can always sell the lathe again after you think you no longer need it. You'll get $200 for it without a doubt, maybe more if you have a lot of accessories for it. Anyway, you simply turn solid rod down to make the tubular bullets, shaping the nose like a jhp, but having say, a .30 cal hole thru a .45, lengthwise and centered. A large, conical hollowbase cavity must be machined into the rear of the bullet, and a matching conical plastic "sealer-plug" must be made. this plug keeps the powder gases/pressure behind the bullet, you see, until the slug exits the barrel. then the plastic is blown backwards out of the bullet by the inrushing air. Such bullets are extremely penetrative. A 70 gr, 2200 fps version, from a lw Commander .45 (using cut down .460 Rowland cases), exited the chest of a full sized hereford bull. A .20 hole in a 9mm bullet, 45 grs at 2200 fps from a 3" barrel, rechambered to 356 TSW, will pierce a kevlar vest with ease, and being made of pure copper, it is legal to own/carry, too. Handgun bullets made of steel, cast iron, bronze or brass are illegal, you know.