![]() The 55 grain SP bullet is marginally stable in a 1:12″ twist barrel at subsonic speeds, and should not be shot in any slower twist rate. If you have a 1:12″ twist, you will need to check bullet stability first before shooting through a suppressor. This ammo is designed for 1:10″ twist or faster (1:9″, 1:8″. This ammo will NOT cycle an AR-15, but you can manually cycle the bolt. This subsonic ammo is not designed for barrels longer than 22″. This ammo is loaded to SUBSONIC speeds for barrels from 10″ to about 22″ barrels. Once-fired LC brass, Hornady 55 grain SP (soft point) 1030 fps. If short barrels are your thing, you'll want to look into Hornady's new 75-grain InterLock HD SBR Black load.Our top selling 223/5.56 SUBSONIC round (priced per 100 rounds). And this load is very suppressor friendly. Not only that but they did it while reducing the blast and sound signature and all but eliminating the flash. I think Hornady's engineers struck a nice balance of acceptable exterior ballistics and great terminal performance. Hornady's SBR load stayed within the FBI recommended parameters of 12 to 18 inches of penetration through all the barriers, which is impressive. ![]() 46 inch and had a retained weight of 69.5 grains, or 93 percent. Hornady's testing using an 11.5 inch barrel showed it to penetrate to an average depth of 17 inches in bare 10 percent ordnance gel 14.7 inches when the gel was protected by FBI protocol steel barrier 17.2 inches after penetrating a wall board barrier 16.7 inches through a plywood barrier and 15.2 inches through an auto glass barrier. Hornady's new 5.56 75-grain InterLock HD SBR Black load penetrates very well while reliably expanding. Testing of both of these loads was conducted using a 16-inch barrel. 60-grain TAP Urban load penetrates even less through FBI protocol barriers and averages between 5.5 and 9.75 inches. As an example, Hornady's 75-grain TAP T2 load in testing conducted by Hornady's ballistic laboratory penetrated to an average depth of 10.5 inches in bare 10 percent ordnance gel 10 inches when the gel was behind FBI protocol steel and wall board barriers and just seven to 7.5 inches when behind auto glass and plywood barriers. 223 Rem and 5.56 expanding loads have relatively shallow penetration. The bullet's terminal performance looks good as well. Practical accuracy seemed more than acceptable for this load's intended SBR purpose. All my shooting was done on steel at 100 yards with red dot sights, and accuracy was in the two-inch range. I noted a 64.9 fps loss per inch of barrel going from 16 inches down to 7.5 inches. Velocity was also consistent round to round. Report and blast were noticeably reduced when compared to the 60-grain TAP Urban load, especially on the 7.5-inch gun. Rounds chambered smoothly, extracted and ejected without issue to three o'clock. The muzzle flash off short barrels typically large and bright even in full daylight.īoth my 16- and 7.5-inch ARs ran flawlessly with the 75-grain InterLock HD SBR Black load. These can distract, disorient and even impair the shooter - particularly inside a room or vehicle in low/no light in a self-defense scenario with no hearing protection. Standard ammunition fired from very short barrels produces excessive muzzle flash, blast and report. Called the 5.56 InterLock HD SBR, this 75-grain load is part of the company's recently introduced Black line. These are the questions Hornady addressed when it developed a 5.56 NATO load specifically for use in short barrels. Sure, short-barrel carbines handle well, carry easily and stow in tight spaces, but are their trade-offs worth it? Plus, just how short can you go while maintaining adequate terminal performance? Will your caliber of choice perform adequately from an 11.5-,10.5- or even a 7.5-inch barrel? With the growing interest in Short Barrel Rifles and Personal Defense Weapons, there's an equal growing demand for hard information on their performance. The load meets FBI specs for penetration and expansion, even from Short Barrel Rifles. Hornady's SBR Black load features a 75-grain boattail hollowpoint with exposed lead tip, propelled by low-flash spherical powder.
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