I have a friend who has loaded several 223 rounds using an RCBS mold. He used Linotype metal and the casting weight is 55 gr. He has used 23 grains of H322 powder. It appears that load will fire at about 3000 fps. A gas check was not used due to lack of availability of correct gas checks. What danger is there that the barrel of the .223 AR-15 will be damaged using the linotype cast bullet? Can he get by just cleaning the barrel after shooting a few hundred rounds at the range? This is not a weapon that will be fired thousands and thousands of rounds.