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Oh, OK...what I'm referring to is that I only used Winchester Power Point HP (high velocity stuff, about 1250+ fps?).
No supersonic 'crack' either.
But my Martini has a long barrel so maybe it...

I made a few suppressors from a short length of 40mm plastic plumbing pipe and 2 end caps. No internal baffles. Was a simple push fit on to barrel end.
Deadly quiet!
On my wee Martini you could aim...