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I've never heard of any warnings from the suppressor manufacturers against the use of standard or subsonic ammo in a short barrel.
The only warning I know of is against the use of the Aguila 60 grain subsonic round. The 60 grain bullet is considerably longer than a regular 36-40 gr round. This round requires a faster twist rifling to stabilize the bullet. You should check with your manufacturer to verify this. I'm sure they would tell you to shoot any standard or high velocity 22 round, but would warn against using the 60 grain round or the powder-less rounds.
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