If you watch the videos, he demonstrates that you do not actually need a press / dies to reload .577 Snider.
Although I have various .577 die sets, I do most of my Snider reloading without.
You can purchase .577 brass, or converted 24 gauge brass hulls. Load them with BP and filler, you can find various loads online or via experimentation, then manually seat a lead round ball (.600), and blast away.
Now that the case is fireformed to your chamber, you can usually manually seat the various assortment of .577 bullet diameters by hand (anything from .570-.600), and experiment until you find something that works for your particular gun.