Here are some BC's that you can use in G1 table. For a free and good ballistics program, go to www.huntingnut.com and download Point Blank.
Caliber BC
.570 .066
.535 .062
.530 .061
.495 .057
.490 .056
.457 .053
.454 .052
.451 .052
.445 .051
.440 .051
.433 .050
.375 .043
.350 .040