6x45 is an easy chambering to love ! My 18" 1:7" 3 groove Pacnor load for Moly 87Vmax, Benchmark 26.6gr, CCI400, ADI brass, Avg velocity 2922fps... Though I only run Moly 105 Amax, H4895 24.5gr, CCI400, ADI brass, for an Avg velocity of 2594fps and dick nothing ES/SD... Hard not to love better...