Thats good info, thanks.
Cant remember where I read where 1680 was temp sensitive.
I tried to figure out if CFE 223 was going to be good in a .17 Fireball but Hogdon did not recommend it I guess.
The CFE BLK might be good. I seem to build some copper in that barrel,
It's pushing my .221 Fireball to 3550 with a 40 grain v max out of a 21 inch barrel.
My understanding based on a conversation with a friend who's been in the commercial reloading biz for decades is that CFE BLK is basically the same powder as 680 which is basically the same as 1680.
