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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
.300 Blackout vs 5.56
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<blockquote data-quote="dolomite_supafly" data-source="post: 1475522" data-attributes="member: 25709"><p>Firing 5.56 in a 223 will increase pressures but if it caused any sort of damage we would hear about it every single day, we don't. It isn't going to blow your gun up unless it has other issues.</p><p></p><p>There was a website that took SAAMI spec 5.56 and 223 gauges to a public range. They tested almost all of the 5.56 marked guns present and more than 25% had 223 chambers. I am trying to find it but I remember reading about it.</p><p></p><p>I have had several other shooters report the same thing, 53 SMK above 3,300 fps in a 7 twist will sling the jackets off. Of course every gun is different but when I posted about it when it happened ~10 years ago I was not the only who had experienced it. It was going ~3,380 fps out of a 26" barrel that was 7 twist. Standard 55 grain FMJ bullets are very different than SMKs. SMKs have a much thinner jacket so the FMJ will not loose it's jacket from centrifugal force like an ALL with a thinner jacket.</p><p></p><p>I will say that my 223 chambers AR shoots better than most of the 5.56 chambered guns I have owned. But for my purposes the difference doesn't matter because I am no longer a paper puncher and shoot steel now.</p></blockquote><p></p>
[QUOTE="dolomite_supafly, post: 1475522, member: 25709"] Firing 5.56 in a 223 will increase pressures but if it caused any sort of damage we would hear about it every single day, we don't. It isn't going to blow your gun up unless it has other issues. There was a website that took SAAMI spec 5.56 and 223 gauges to a public range. They tested almost all of the 5.56 marked guns present and more than 25% had 223 chambers. I am trying to find it but I remember reading about it. I have had several other shooters report the same thing, 53 SMK above 3,300 fps in a 7 twist will sling the jackets off. Of course every gun is different but when I posted about it when it happened ~10 years ago I was not the only who had experienced it. It was going ~3,380 fps out of a 26" barrel that was 7 twist. Standard 55 grain FMJ bullets are very different than SMKs. SMKs have a much thinner jacket so the FMJ will not loose it's jacket from centrifugal force like an ALL with a thinner jacket. I will say that my 223 chambers AR shoots better than most of the 5.56 chambered guns I have owned. But for my purposes the difference doesn't matter because I am no longer a paper puncher and shoot steel now. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
.300 Blackout vs 5.56
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