I can't imagine a scenario nor is it on my radar where modern ammo would run out and seems beyond the scope of ETS forums. That said, there are plenty of other methods of catching game which may or may not be legal depending on your countries or jurisdictional law and may also violate the ETS terms of rules by discussing here.

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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock