BLC is too fast to be likely. Kinda looks like superformance to me.... or any other ball powder really.
It's likely not a cannister powder - It's a large batch OEM powder. Don't try to re-use it based on it looking similar to another commercial powder.
One could probably assume it's somewhere in the 4350 burn range. Either "mexican match" it with a similar weight 103-108 class bullet, or just shoot it as is because it's probably not worth the trouble to f with.