Yes it is.
What's it's name, or at least, what kind of load, as there are a slew of measuring devices for gunpowder, but none serve this one's purpose.
A grain is an increment of dry measure, not the actual # of grains.
Go visit the Google thread, (lol). You could probably type in 1 grain = ? oz and get an answer.
I was goin to guess to measure charges charges for a musket or muzzle loader. But if that doesnt qualify under reloading bullets Im going to guess for filling blasting caps.
Whew! I'm glad someone said it. Y'all were dancing all around it.
And it has the very technical name of Powder Measure
Black powder is a very different type of powder than the powder used for today's bullets. No need to measure near as precise. You take the powder horn, pour the powder in the powder measure (to wherever you have it set at), then pour the charge into the end of the barrel on the muzzleloader. The funnel end on the first pic I posted hinges out of the way to make filling the powder measure more easy, then slides back into place to make pouring the powder down the barrel more easy. This item has the specific use of measuring black powder. Muzzleloader Powder Measures And Funnels Supplied By, The Possible Shop, Headquarters For Your Muzzleloading & Cowboy Action Supplies