My 204 will push a 40 grain pill about 3800 fps, my 243 will push a 55 nosler at 4100 fps with lapua brass. The bc of the 243 55 grain pill is .276. The bc of a 204 40 grains is .239. The 243 will knock the socks off of a 204 when it comes to energy delivered esp at ranges in excess of 300...