secrets all secrets I say but if you want one of the best I have so far...
once fired brass not resized no crimp 530 gr lead flat nose (.512 dia) spg lubed bullet(buffalo arms) 89 gr goex ffg droped through a 36 in copper drop tube no compression a .015 fiber over powder card a .060 disc of spg than another .015 card seat the bullet to the top band its a lighter recoil load pushes the bullet at 1250 fps and makes a big 2in outer edge to outer edge group at 100 yards in my gun, a sharps with a 32in barrel.
sometimes with this load it will send the grease smokeing down range, tells me its too much lube but its accurate so I kept this one, I have not tried smokeless yet but I just got in some 550 gr solid bullets(.510 dia)