6/22/2023 0 Comments Subsonic 223 reloading dataI wanted to look further into the differences between using and not using a cotton filler.īatch 1 was using a 69gr Sierra Match King #1380 with 4.6 grains of Trail Boss and cotton fillerīatch 2 was using a 69gr Sierra Match King #1380 with 4.6 grains of Trail Boss and NO cotton filler I have not yet tested my grouping at 50 and 100 yards with this recipe as I am waiting for new scope rings. I feel this is a very useful load to have and I'd be very interested in seeing what others came up with in regards to. In a true SHTF scenario, this could be a life saver if you need to kill your food silently without alerting those zombies around you as to your location. With proper shot placement (all shots should be properly placed) you CAN take down deer sized game out to 100 yards with this round. Remember, this is a 55 grain projectile at 1005 FT/s delivering 123 ft-lbs of energy. 223 that can be whisper quite and still take down game out to 100 yards. This will keep the 3.8 grains of powder over the primer hole ensuring full ignition of the powder when the primer is struck.Ĭouldn't get a great photo, but the cotton should fully cover the primer and be significantly lower than the bullet base when seated.Īfter seating and crimping the bullet in the normal fashion, take a black sharpie and color the tip of the round black so you don't get them confused with your super-sonic ammunition. Using your punch tool, gently push the wispy cotton into the case. Stretch out the cotton so that it looks like a bad Halloween spider web - very wispy and airy. 22lr round at 1000 FT/s is 88.8 ft-lbs)Īfter charging your primed case with the 3.8 grains of powder, rip off a tiny piece of cotton from a cotton ball - (quarter shown for size comparison.) This gives me 1005 FT/s at 123 ft-lbs of energy. The cases were trimmed to 1.743" and the Over All Length (with seated bullet) is 2.220" using a Speer 55 grain HPBT projectile.ģ.8 grains of the IMR Trail Boss powder is what I fine tuned. This was tested and dialed in on an AR-15, 16" barrel, 1:8 twist, mid-length gas system, with a YHM Phantom Suppressor. 308 ammo.Įveryone's weapon is different so don't use this recipe and expect the exact same results. It's primary design is for Cowboy Action type firearms - but it's large signature and fast burn rate make it an exceptional choice for creating subsonic. 223 ammo:Įverything needed to create a subsonic 55 grain round that will deliver 128 ft/lb energy at 1000 FT/sīullets, casings, scale, sharpie, cotton balls, punch tool, Trail Boss powderĪs you can see, the Trail Boss powder is seriously huge. Here is a general step-by-step on making subsonic. So, after another full day of experimenting, I've landed with the best recipe I can make for a 55 grain round and my weapon platform. For this reason people shooting with a silencer prefer subsonic loads, even when shooting a rifle.I've been tinkering over the past few weeks trying to use different powders and loads to create the perfect (for me) subsonic. As a side note, if a silencer is attached to the gun it will only suppress the muzzle-blast noise. Subsonic loads do not have this second component of noise. The noise that shooting makes has two components, the noise of the hot gases escaping the muzzle and sometimes flashing as they hit the atmosphere (muzzle blast), and in the case of supersonic loads the crack of the sonic boom as the bullet breaks the sound barrier. Most rifle loadings are all supersonic, so subsonic loads are specially down-loaded to stay below the speed of sound. In 9mm, most loading data are supersonic. All data in this caliber is subsonic but is not normally tagged with the name subsonic. Not all "subsonic" loads are noted as such in the data, because the cartridge is not capable of producing supersonic velocity. Subsonic loads refer to those whose velocity is less than the speed of sound.
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