The gun was designed to be fed from the magazine. That is to say, you push five rounds down into the internal magazine.
However, since you're testing it, single shot it. You don't have to fire five either. Fire only one and examine the case. If there's any flattening of the case head or the primer, ballooning or cracking of the case, don't shoot it anymore. It's has excessive headspace and the barrel shank must be reduced (cutting down the shank reduces the length of the chamber and eliminates the headspace issue).
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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