TheDDM4V5300AACBlackoutwithBurrisMTACCQB.DD forgesitsownbarrelsandhasproprietaryrails—both arealsosuppliedtoothermanufacturers. The6-positionstockandmagazine arefromMagpul. Photo: Robbie Barrkman and trouble-free operation. The Quick Detachable Burris, PEPR mount places the MTAC 2.7" above center bore and provides a firm platform for the sight. Shooting Available ammunition ranges from the 110-grain lead-free Barnes bullets used in three of the available loads, to 155-grain jacketed rounds and a 220grain nominally subsonic round from Remington. Barnes calls their leadfree bullet “Tac-Tx” and loads them in their VOR-TX ammunition line, while CorBon calls the same projectile the “DPX” or “Deep Penetrating X Bullet.” Barnes has tested the round for expansion, penetration and weight retention out to 300 yards in standard and short-barrel arms. The Texas company RTBA LTD loads their “Right to Bear” Blackout round with the Barnes also. While Barnes stops short of applying the popular neologism “Barrier Blind Bullet,” others do not, and there’s a broad consensus the Tac-Tx is excellent for military/police operations. Performance-wise in our testing, the Barnes and CorBon loads are virtually identical. Both produced groups of under 2", with the RTBA load not far behind at 2.2". The Barnes had an accuracy edge over the heavier bullet loads, however. Not surprisingly, the slowest burning of the pistol propellants are the powder-of-choice for full velocity han- dloads. Barnes suggests Hodgdon H110 but others mention Lil’ Gun and WW 296. With a limited number of empty cases on hand, we tried a couple of handloads using Sierra and Hornady 125-grain bullets over published starting loads with Lil’ Gun and H110. Both shot 3-round groups of less than 1" at 100 yards and displayed small extreme velocity spreads, enhancing accuracy. The full-velocity loads displayed the expected consistency, with extreme spreads from 30 to 50 fps. All were functional in the M4 rifle, and also worked perfectly with standard .223 magazines. The single available box of subsonic loads (thanks to the ammo shortage at the time of testing) was a Remington loading of a 220-grain bullet. There were no failures to function with or without a suppressor in place in our limited observation, although extreme spreads with this ammo were quite wide. Unsuppressed, five rounds went over the chronograph at subsonic velocity. With the added length of the Yankee Hill Machine (YHM) suppressor, three of five rounds actually exceeded the nominal 1,120 fps representing the speed of sound at sea level. The topquality suppressor did obviate the need CoMparison barnes vor-tx 300 bLaCkout Velocity(fps) muzzle 2,339 100yards 2,082 200yards 1,841 300yards 1,642 trajectory(inch) n/a 0 -5.28 -21.12 .223 20" barreL 55-gr. nosLer bt Velocity(fps) muzzle 3.030 100yards 2,706 200yards 2,403 300yards 2,121 trajectory(inch) n/a 0 -2.05 -10.21 for additional hearing protection with full-velocity loads, and our best group overall was recorded through the unit. To all indications, this Daniel Defense design in 300 AAC will emerge from the current ammunition drought and become a military and law enforcement staple! * 31 For more info: www.americancopmagazine. com/product-index and click on the company name. WWW.AMERICANCOPMAGAZINE.COM
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