[castnblast]

I'm still jacking w/ this new camera I got, but I'll hopefully post some pics shortly of Benchmark powder. You'll see from the size of it, it will meter as good if not better than ball powder. It's about the same size, but is a true extruded powder, which as you may or may not know, is very resistant to temperature variations. It's a great 308 and 223 powder so I'm told. Mrawesome 22 and I have each bought a can and had excellent results out of our 22-250's. You'll want to use a fine powder so you get a consistant powder throw out of that 550. Also, you need to work it just a tad slower than your pistol rounds, because the larger charge is going to take a bit more time to drop into the case.