I'm begining to work with Blackhorn 209. I measured out my charge by volume, then weighed the charge on my scale. Using the vials pictured above, which are available in lots of 20 on Ebay, I filled each vial with an exact charge by weight. It is very easy, fast & convenient to just bring 20-30-40 little pre-filled vials to the range for load development.
The nicely made vials only cost $7-$8 per 20ct including S&H to your door. I bought 20 5ml bottles and 20 10ml bottles. The 5ml bottle will hold 120gr (volume measure) of BH 209 but its full to the top of the bottle. The 10ml bottles are 1/2 full and make pouring into the muzzle a bit easier. For $15 bucks you'll have plenty of both.