The pic of the bullet the OP posted are some I cast and coated some time back. The mold is actually made by NOE and cast a slightly heavier / larger dia. bullet than the original design but not enough to make any real world différance in the load data used. The bullet shoots and expands well with the gas check left off for up to 38+P loads but I use a check for all 357 Mag loads.
I powder coated those bullets using the shake and bake method. Powders used at the time were Smoke Yellow Green and Carolina Blue.
Pre Powder Coat days, 357 Mag. with traditional lube on the left and recovered 38 +P bullet tumble lubed with 45/45 /10 with gas check left off on the right. Alloy used was 50% pure lead and 50% of my COWWs with a pinch of tin.
Bullets can be loaded to almost identical length in 38 Special cases using the lower crimp groove. This also allows you to load light to med. 357 mag loads in 38 Special cases in a pinch if you find it necessary to do so.
The Mold came with both HP and FN pins. I pretty much leave the HP pins in all the time since I have several SWC 38/357 molds.