Rich,SST. 70 grains
SS 73.5 grains
Max. 77.4 grains
Sherman 76 grains
All have available
head stamped brass
Both the Sherman amd max will hold around 70 grains of dense powders and the SM holds 90.
I client recently built a 26 SM and ran the 156 Berger up to 3508' I believe.
..........You’ll need a very slow burning powder you can’t find right now, a bonded , high ballistic coefficient bullet that holds together at close range yet expands reliably at lower velocities, readily available brass.....