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.
#Reloading data for subsonic 223 full
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. I've been tinkering over the past few weeks trying to use different powders and loads to create the perfect (for me) subsonic.
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