Direct from Oregon trail bullets, They have extremely hard alloy of 22-24 BHN
There is no
magic load data for their bullets, any data for hardcast bullets of the same weight will work. So seek out your manuals, the powder companies and you will find what you seek.
http://www.laser-cast.com/files/LM_B...Obturation.pdf
http://www.laser-cast.com/files/LM_B..._Revolvers.pdf
http://www.laser-cast.com/files/LM_W...o_Accurate.pdf