Sounds like you are stuck with having to but a box of each ammo that advertises a below speed of sound velocity,that you can find,and testing them out.
I strongly suspect you know this,but I'll say it anyway for others reading-you don't have to shoot up all of each box! It's hand to have them on hand for when down the track you end up with another .22 to find a load for.
There is probably a market for a dealer to sell trial kits of ten rounds of each .22 they stock
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