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Nope.
Rim and base diameters are wrong.
.30-40 cases be used with minimal effort. But they are usually harder to obtain than .303B.
I have heard of people using .303 Savage. But there is a lot that doesn't add up with that one. .303 Savage can be used to make 7.35x51mm, bit it makes no sense for .303B.
It is also generally not available.
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Don't even try it. It's even worse than the internet would lead you to believe.
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