Hornady used to tell you right on the factory loaded box of ammo that they used h4350 powder in the 6.5 creed. last I checked common canister powder.
Check your facts before you make wide sweeping statements.
Buy the Berger reloading manual . Great place to start.Ammunition companies do NOT use the same powers as we do.
We use "Canister" powders, that are blended (like fine whiskey) so each can we buy, this year or next, is the same as the can we bought last year (within tiny limits).
Ammunition companies use "Bulk" powders - they buy 10,000 or 50,000 pounds of a bulk powder within a given burning range - each batch will be close, but not the same - each lot of ammunition will have a different load - one lot might be ball powder, and the next might be stick powder.
So don't chase a non-existent powder.
Start with a good powder (that you can actually buy) and work up a load - you can probably do better.