VULCAN questions

Wondering how much of a sound difference between the .22 and the .25 VULCAN. Gen 4 in stock form. No LDC.

My .25 @ 45 FPE has a pretty loud crack to it without the Donnyfl. Is the .22 significantly quieter? Especially if it were tuned down to 20-25 FPE?

Thanks in advance
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Matt