Well to start, the gun is called the model 12 "Long range Benchrest," it is called that because of its design, and intended purpose is for long range Benchrest. With that said they looked at what is popular in Benchrest and built the rifle around that. (except for the 308 chambering, don't know why they offer it in this gun.) You will be hard pressed to find anyone shooting 600 or 1000 yard bechrest shooting a 6.5 caliber, especially the 6.5 Creedmoor. Savage does offer the chambering in the model 12 long range precision rifle, so with that said you could order the gun your asking about through the custom shop. You may want to look at some bullet BC charts, you may find that the 6mm have just as good, if not better BC than any of the 6.5 mm. Remember to compare apples to apples, look at like weights. As far as barrel life, that is more dependent on the amount of powder used than the caliber. 6mm BRs have a long life.
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