Hodgdon Data Manual #27 list 4.9 grains of Bullseye as a MAX load with a 125 grain FMJ bullet and a Win SP primer. C.O.L. is 1.150" There is no data given for the 147 grain bullet and that powder. As always - start 10% below max and work up! I too have been using 4.2 grains with good results.