Did some testing with @Moa Hunter a while back. He had some CCI subs that were a bit load in his rifle he generously let me try.
Had quite a crack and put it across his chronograph. Supersonic about 1 in 4 i think.
Tried them in his gun and they were running supersonic every one.
Tried 22 longs? think winchester called them zimmers. they were very quiet and albut a long rifle in length.
More luck in functioning than a short.
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