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Transonic speed means that some part of the bullet will be creating supersonic airflow and it will sound just like a supersonic shot. You will hear a crack. Its not as loud and may be a very short crack if you are shooting at longer ranges as the bullet slows dropping out of the speed range. The speed of sound varies depending on temperature so what makes noise at one temp may not at another. We've been trying to keep loads at 1000fps as we've never noted any transonic cracking at that speed, it is a nice round number which works well in calculations and keeps about the max velocity you can really use. 975fps sounds like a pretty small drop but its 5% slower. In the end you mainly need to work up a load that is consistant as all your range tables can be done for any load but the tables are only good if you have a consistant load. The drop difference at 300yds is pretty substantial between 5% + or - so be consistant.
Frank
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