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I have had good luck with TAC, since TAC is a ball powder it will meter well in your 550 ,
but there is a good selection of ball powders that will pair up with your AR and your dillon 550
 
My experience with 748 and Tac (ball powders) is that they are much dirtier than extruded powders. True they meter very nicely, but a stick powder burns cleaner and leaves less residue. I would recommend H4895.

Just my .02 cents.
 
TAC is also my first option in my .223 Rem handloads. If you want an extruded powder, I suggest looking at IMR-8208 XBR. It is fine grained enough that it is decent in a powder measure and is probably more temperature stable than a ball powder. FWIW, I use TAC with bullets from 40 gr to 77 gr, in 10 1/2", 16", 20", and 24" AR's and 22" and 26" barreled bolt guns. That being said, there are lots of powders that will provide good results in the .223/5.56.
 

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