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The Range
Ammo & Reloading
Subsonic Ammo Turning Supersonic
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<blockquote data-quote="tulsacrittergetter" data-source="post: 3035139" data-attributes="member: 41264"><p>Hey guys. Been a long time since I posted. Hope everyone is doing good. </p><p></p><p>I have an issue with a couple different types of ammo. I am shooting 300 Blackout subsonic rounds (220 grain) through a 16" barrel with a 7.5" suppressor. The report from the muzzle is very quiet, but I'm still getting a sonic crack when the rounds are fired. I know what subs should sound like. I shoot several suppressed .22LR's, and there isn't a sonic crack, and there shouldn't be.</p><p></p><p>The same thing happened this morning with some .223 subsonic 60 grain rounds I purchased from <a href="http://beckammunition.com/ammunition/.223-Rem/223-rem-subsonic-60gr-v-max-subsonic-new.html" target="_blank"><u><span style="color: #4da6ff">Beck Ammunition</span></u></a>. I shoot a lot of varmints at night (suppressed .22LR), but I need something more powerful than .22LR for the larger raccoons. So, I thought I would try the subsonic .223's since most of my targets are 50 yards or closer. I just stepped out back and popped off a few of the .223 subs, and they were very quiet, but I heard a sonic crack from both rounds.</p><p></p><p>What the heck? Under what conditions will a subsonic round turn supersonic, and how can I fix this? Is it the longer barrel? Usually, 300 Blackout subs are shot from 10.5" barrels with suppressors. So, maybe shooting 300 Blackout subs from a suppressed 16" barrel would cause the round to gain some velocity? Also, the .223 sub was shot from a suppressed 20" barrel, 1:9 twist. So, in both cases, a longer than normal barrel was used. </p><p></p><p>Any information from you guys will help. Thank you.</p></blockquote><p></p>
[QUOTE="tulsacrittergetter, post: 3035139, member: 41264"] Hey guys. Been a long time since I posted. Hope everyone is doing good. I have an issue with a couple different types of ammo. I am shooting 300 Blackout subsonic rounds (220 grain) through a 16" barrel with a 7.5" suppressor. The report from the muzzle is very quiet, but I'm still getting a sonic crack when the rounds are fired. I know what subs should sound like. I shoot several suppressed .22LR's, and there isn't a sonic crack, and there shouldn't be. The same thing happened this morning with some .223 subsonic 60 grain rounds I purchased from [URL='http://beckammunition.com/ammunition/.223-Rem/223-rem-subsonic-60gr-v-max-subsonic-new.html'][U][COLOR=#4da6ff]Beck Ammunition[/COLOR][/U][/URL]. I shoot a lot of varmints at night (suppressed .22LR), but I need something more powerful than .22LR for the larger raccoons. So, I thought I would try the subsonic .223's since most of my targets are 50 yards or closer. I just stepped out back and popped off a few of the .223 subs, and they were very quiet, but I heard a sonic crack from both rounds. What the heck? Under what conditions will a subsonic round turn supersonic, and how can I fix this? Is it the longer barrel? Usually, 300 Blackout subs are shot from 10.5" barrels with suppressors. So, maybe shooting 300 Blackout subs from a suppressed 16" barrel would cause the round to gain some velocity? Also, the .223 sub was shot from a suppressed 20" barrel, 1:9 twist. So, in both cases, a longer than normal barrel was used. Any information from you guys will help. Thank you. [/QUOTE]
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