Other possibilities:Preheat soft lead buckshot on your mould warming tray to just before the melting point, drop it in the mould cavity then pour your lino over it. When this works, it works well, just make cetrain you have removed any graphite or other coatings from the shot before using. Or ditch the lino, and use magnum shot instead, with 2-3% of tin added. Air cooled, this should give you about 18 bhn, and be ideal for hunting with the 30-30. This can also be heat-treated by water-dropping the bullets from the mould for extra hardness. Then anneal the bullet noses by standing the bullet in a pan of water, with the water level just above the bullet shank. Then take a propane torch and heat the bullet noses once again just until the melting point. You'll have to do some experimenting to get the right amount of time. Then leave the bullet undisturbed until they cool on their own. This should give you soft noses and hard shanks too. I've never tried this with lino, so it may work for it too, but linos so doggone expensive that I've been hoarding what I have left, and have been using magnum shot instead.
Bob