As said, DON'T! Very, very bad, UNSAFE, idea.
Col. Nonte went over this in one of his books. The powder maker has no EXACT idea what will come out when they start making powder. They load the machine and turn it on and have to "see." Yes, they will know if it is ball or stick or small stick like 4227 vs large stick like 4831, etc. In European ammo I have found flakes that looked like they were cut from a flat sheet and the legendary cordite from Britain, yes, looks like spaghetti, BUT then they take some into the lab and test it/burn it. IF it is near a "canister grade rate" that is packaged and sold to the public in 1 lb cans 8 lb jugs, etc. then they set is aside and when they need more canister grade, they blend and coat what they have to come close to the canister standard. This you can buy. And you are advised to cut back hot loads and work up with each new container of powder...
On the other hand the ammo makers who load a couple million rounds a month buy drums of the "mill run" powder and run their own tests and set up their machines to the proper load for that powder in that round... And turn the machines on...
What you see may look just like, say, 3031, but it may burn like 4227 or 4320 or
Attempts to match in this manner is begging for trouble and injury to your person. Hodgdon used to sell surplus that was "close to" and said, "use XX data" but Bruce (SR) told me they stopped for liability reasons, many, many years ago. Luck. Happy Trails. Stick to published data please.
