Trouble finding agate flints

[MountainHunter01]

I have been trying to find 5/8 cut agate flints. They spark much better than English black or French blonde in my rifle and seem to last a lot longer as well but I cannot seem to find them anywhere. Does anyone know of anywhere online that has them in stock?

 

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https://thegunworks.com/shop/flints-and-flint-tools/flints/sawed/flint-5-8in-3/


https://rmcoxyoke.com/product-category/muzzleloading-accessories/flints/