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Do you know of any manufacturer that may have this caliber on hand or is it really that obscure?
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The 'caliber' is 22. It's a common standard.
No, you can't buy 22Dasher ammo at Walmart. It's a wildcat.
Don't take it wrong, I'm trying to help you.
You need to pick up a reloading book and learn the basics. Then, research wildcat cartridges. Earn the knowledge.
Then, when you ask questions, and people take the time to answer them, it won't be a complete waste of time. You won't frustrate a gunsmith, wanting something beyond your understanding. And you won't waste time and money in a failed rifle project.
99% of what you'll get from this cartridge is knowledge. You'll realize this once you've made the ammo successfully. And I would recommend you do so before spending a dime on a rifle for it. If nothing else, so you'll know what to order.