There is many MYTHS about shooting lead out of your gun. You can use reduced loads and I will give you a better ones but, you have to use lead bullets with them. Now, If you really want to have some fun, And do this right, then get ready to see performance out of your rifle that you have not imagined. SR4759 13 grains is MAX and gives you 2000 FPS from Speer Book w/ Speer Bullet. SR4759 12 grains MAX gives you 1982 FPS from Speer Book with a 50 grain SPEER bullet That's OK just so you know ahead of time. Blue Dot 16-18 grains 2800 FPS -3000 FPSĢ H4350 31 grains gives you 2800 FPS w/ 86% of case capacity. RE 10X 30 grains is minimum, and that will put you in the 3000 FPS range.ġ. Blue Dot 18-21 grains give you the speeds of 3000-3300 FPSĢ. But try these other loads if you would like, Or give us some more information about what powders you do have and barrel length.ġ. If you have a 22" barrel then it will be about 100 FPS less. So up the charge to 21.0 grains and you will burn 99% of the powder,be at 59.6 % of the case capacity, and be in the neighborhood of 3000 FPS with a 24" barrel. The load that venatic gave you is slower than what you ask, and it does not burn but about 95% of the powder. I have found with the reduced loads that the 50 grain VMax gives the best performance. I usually do not go with "Full House" loads in the 22-250 anyway. I have reduced loads for the 223 mostly as apposed to the 22-250. I am going to pass along some info that is from my personal experience. The only time subsonic unsuppressed is not loud is something like 22CB in barrels 16" and greater or 22lr std vel in a much longer barrel.The AA5744 is used often for reduced loads. Subsonic ammo is still loud, especially in a short barrel, so I only see it as a benefit when shooting with a silencer attached. You might be disappointed with subsonic 223 as a 70 grain bullet while much more powerful than any 22lr (subsonic or hypersonic) is rather weak compared to a subsonic 240 grain bullet from the 300 blackout. Most people (like me) settle for cycling the bolt carrier for each shot. This means it has the gas port about 4-6 inches down from the chamber like a 300 whisper or 300 blackout does. The speed of sound varies only with temperature so I load for 1050 fps to keep it subsonic when cold and to avoid bullet flight noise near sonic speeds caused by air flowing around the curved bullet.Īn AR-15 in 223 will not cycle with subsonic loads unless the gas system was made for it. If your accuracy suppressed is worse than unsuppressed, then you are getting baffle strikes. Check for keyholing without the silencer attached. I would not use the heavier match grade bullets at subsonic speeds. The Speer 70 grain bullet works just fine with a 1-9 twist subsonic. Round nose bullets are much more likely to remain stable than the longer FMJ or boat tail bullets, the BC does not matter as much when subsonic, they all suck as far as the rainbow trajectory is concerned when shooting past 100 yards. 7 grains of WC820 works well with the Speer 70 grain bullet. Start high and work your way down to the velocity you need to avoid getting a bullet stuck in the bore. The key is magnum pistol powders that burn fast and consistently. I load my own subsonic 223 using surplus WC820 (like H110) although any pistol powder will do.
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