What about this one from TSC. It has alot of calcium for antler growth:
Producer's Pride® General Purpose Mineral Block is designed to provide needed minerals and vitamins, including salt, to mixed herds containing sheep grazing pasture, rangeland, or drylot forages. Provides the critical vitamins and minerals needed to support optimal health, reproduction and growth, providing, what is often lacking or unbalanced in native pastures and forages. It contains no added copper and is appropriate for all classes and ages of sheep. When feeding beef or non-lactating dairy cattle or goats alone, an additional source of copper may be warranted.
Ingredients:
Calcium Carbonate, Salt, Monocalcium Phosphate, Dicalcium phosphate, Cane Molasses, Wheat Meddlings, Magnesium Oxide, Manganous Oxide, Zinc Oxide, Ferric Oxide, Vitamin E Supplement, Ethylenediamine Dehydriodide, Vitamin A Supplement, Cobalt Carbonate, Vitamin D3 Supplement, Sodium Molyboate, Calcium Iodate, Ferrous Carbonate, Sodium Selenite.
or this
