Subsonic 223 load data h3356/7/2023 ![]() Many other shooters are much more serious with sub use than I am. In my use, subs are good for shits and grins while impressing your friends with your cool silencer. The sound comes from the point of travel nearest your position and drowns out any noises from the gun. When a supersonic bullet passes your position downrange, the sound is much like someone standing nearby and shooting a 22LR. Therefore the shooter's location is much harder to pinpoint because the crack drowns out any other noises the gun makes in most circumstances. The supersonic crack comes from the bullet, not the gun, and follows the bullet downrange. I'll keep the terminal performance of normal velocity ammo and put up with the sonic crack. There ARE bullets specially designed to perform at sub-velocity but are pretty costly. .223 Remington Subsonic Loads (Hodgdon data) Warning Case: Winchester Twist: 1:12 inches Barrel: 24 inches Trim: 1. The only change was rifling marks on the jacket. Even with normally exploding varmint bullets, many of them could probably be re-used after shooting them into water. The high performance expanding hunting bullets will NOT be high performance at 1050fps. In addition the speed of sound varies with temp so running at 1100 which is the speed of sound at sea level and standard temp and pressure (59 deg F and 14.7 psi) may be supersonic at lower temps.Īfter much testing and tinkering, I decided I had no PRACTICAL use for subs in calibers meant for supersonic use. Subsonic loads need to be under 1100fps and in reality need to be in the 1050fps range due to acceleration of airflow over the curve of the bullet which will cause local sonic booms if you shoot at 1100fps. 223 and 50-55gr bullets I would start at 4gr N310 and reduce the load until you're subsonic / happy with. I have safely tested up to 6gr N310, so no safety concerns in the unlikely event that I double charge a case. There are subsonic 223 loads listed on hodgdons website. I use 3gr N310 with an 83gr cast bullet (about 980fps) in my 6x45 (6mm-223). So to answer the original posters question: no I don't know of anyone (living) who is using 4064 for subsonic loading in either. Vihtavuori N310 is a great powder for this. Accurate 4100: Accurate 5744 300 AAC BLACKOUT (Subsonic Loads) Barrel: 16. Having 10gr of powder rattling around in a case with a capacity of 50grs makes it tough to keep things consistent. Shooters World Load Data PDF MSDS Download See Burn Rate Chart Testimonials. The other possibility is to make up cartridge cases with reduced capacity by either machining them from bar stock or filling existing cases with epoxy or lead or something and then making a smaller powder chamber. 308 you are better off with the 300 blackout as it gives you a choice of powders that will allow you to come up with something accurate instead of something that just shoots. You'll probably have much better accuracy too. 22LR as its much simpler than trying to get a 50gr bullet out of that long barrel subsonic. of IMR3031 with CCI standard small rifle primers and Hornady 55 grain FMJ-BT bullets. Our Favorite 223 remington load is 21.5 gr. You have way too much case capacity and you will need a powder that fills the case at least 50% in order to avoid some destructive booms and also to help improve consistent ignition. With a wide range of bullets to choose from you would be hard pressed not to find a load to fit your rifle or situation. 223 loads you don't just pick a powder and decide to load subsonic with it. In fact after I mixed the fired casings I couldn't tell them apart.With the full sized 308 and. From 21 to 25.5 grain charges I saw no significant difference between the two primers. I did side by side comparison using WC-844 and 55gr FMJs with CCI-400 and CCI-450. 308 Win size or smaller when using a ball type powder. 222 Remington that offered powder capacity and velocity increases. military adoption of its twin cartridge Cartridge, 5.56mm Ball, M193 for the AR-15/M16 rifle. From my own experiences I haven't found the need for a magnum primer in any cartridge. 223 Remington began in 1957, and it became commercially available in January 1964, about a month prior to U.S. Because often I believe at least, the newer data is more accurate.Īs far as primers go any Speer manual would be recommending a CCI-450 with H-335. I have some older data sources that would suggest around 26gr H-335 as being maximum with a 62gr bullet but that's sometimes why using newer data is better. My plinking loads using 55gr bullets and 22gr WC-844 are very brass friendly and these are often loaded in Federal brass. It does however seem to run hand in hand with load pressure. I have some loads that are top end but most are not. I get loose pockets before even getting split necks. 223/5.56 seems to be a different animal than others.
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