I found some AA1680, locally, but I haven't located a can of CFE-BLK yet. Does anyone have any input on either of these powders, one versus the other? Are there other powder options I should consider?
They are very close. Another one to consider is Shooter's World Blackout. The initial numbers made it look like a 1680 beater, but real world, it seems very close to 1680 as well. Maybe lot-to-lot variation?
These cartridges are right on the edge for usefulness with W296 & H110 as well. I doubt you can get the velocity of 1680 with them and they can be iffy depending upon your gas system, but if you have a cheap source of them you might want to fool with them. You can try surplus carbine powder too - WC820. It's a 296 type powder.
