WHAT DOES BULK 300 BLACKOUT AMMO MEAN?

I'm about to get some 220gr subs and see how they sound. I  am also maintaining my eyes open up to get a srd726ti-q to point out up at an excellent rate and sick get just one. Mainly because of the pounds on the big volume cans I feel the titanium will accommodate me better then the heavier Sco Specwar.300BLK definitely shines with a brief barrel