For the average hunter inside if 400 meters, not very much.
The advantage to the 25CM is higher velocity with higher BC bullets than 6.5CM, and higher BC bullets than 6CM, a bit slower but better barrel life.
For the most part the only people who will benefit greatly changing to this cartridge are long range shooters looking for ever bit of performance they can.
Otherwise it just joins the very long list of cartridges that'll be fine for the average hunter.
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