Can't find a lot. Anyone have good recipes they'd care to share?
The ss109 are longer than other 62gr projectiles, because the mild steel weighs less than lead.
When faced with a projcetile that has little load data associated with it, you can usually start with load data from a heavier projectile, in this case 65 or 69gr, and work your way up looking for pressure signs/accuracy (and velocity if you have a chrono). The ss109 will be closer in length (bearing surface) to those heavier projectiles, and powder charge goes down amd projectile weight goes up, so the loads for 65 and 69 gr should be safely under max for the ss109.