Not sure if it was leading, but with the CB's in my bolt action Marlin 25, you kept a group for about one mag or 7 shots. If you did not clean the microgroove barrel after that, they went completely out of minute of squirrel.
Right before I moved, I started shooting the CCI quiet and did not notice any accuracy degradation in about 20 shots.
Both sounded about the same through a 16" barrel.
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