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The Range
Ammo & Reloading
Subsonic Ammo Turning Supersonic
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<blockquote data-quote="Mad Professor" data-source="post: 3035150" data-attributes="member: 5316"><p>1) Have you Chronographed any of the mentioned ammo? Or are you basing everything on your ear and manufacturer claims?</p><p>2) I don't see a 60 gr .223 on Beck Ammunition's page. I see 52, 55, and 75gr and they are targeting all of them at 1010.</p><p>3) What manufacturer of 300BLK 220? I clocked Remington factory 220s at 1091-1167 with an average of 1126 from a 16" barrel, the same ammo went 869-971fps from a 9" barrel. The ES and SD of both were not what I call acceptable. But I've clocked some reloaded ammo that was just as bad. My reloads (mixed case) using A1680 with a the same bullet were 918-945fps from a 9" and 1095-1120fps from a 16" barrel. With the test of my ammo, I would be increasing the speed a bit on my 9" load and maybe backing off a touch on my 16" load if I was gathering critters with it. Maybe target 1050-1070 fps. </p><p></p><p></p><p>The speed in which they will break the sound barrier will depend on the air density. So primarily air temperature will be the biggest factor.</p><p></p><p>Different powder burn rates will greatly impact what the effect of barrel length will have on the speed.</p><p> </p><p>Also most bullets for 300 won't have any expansion at subsonic speeds. If you want expansion, you need to be looking at some of the exotics like Maker or similar. </p><p></p><p>In the .22 world for varmit, you might try one of 2 segmented ammo offerings from CCI. They are pretty devastating on small game. #0064 is 32 grain rated at 1640fps #0074 40 grain rated at 1050fps. I don't see supersonic speeds from the #0064 out of a suppressed pistol. They make a "quiet" version #0970 that is only 710fps, but I'm not sure I would mess with it.</p></blockquote><p></p>
[QUOTE="Mad Professor, post: 3035150, member: 5316"] 1) Have you Chronographed any of the mentioned ammo? Or are you basing everything on your ear and manufacturer claims? 2) I don't see a 60 gr .223 on Beck Ammunition's page. I see 52, 55, and 75gr and they are targeting all of them at 1010. 3) What manufacturer of 300BLK 220? I clocked Remington factory 220s at 1091-1167 with an average of 1126 from a 16" barrel, the same ammo went 869-971fps from a 9" barrel. The ES and SD of both were not what I call acceptable. But I've clocked some reloaded ammo that was just as bad. My reloads (mixed case) using A1680 with a the same bullet were 918-945fps from a 9" and 1095-1120fps from a 16" barrel. With the test of my ammo, I would be increasing the speed a bit on my 9" load and maybe backing off a touch on my 16" load if I was gathering critters with it. Maybe target 1050-1070 fps. The speed in which they will break the sound barrier will depend on the air density. So primarily air temperature will be the biggest factor. Different powder burn rates will greatly impact what the effect of barrel length will have on the speed. Also most bullets for 300 won't have any expansion at subsonic speeds. If you want expansion, you need to be looking at some of the exotics like Maker or similar. In the .22 world for varmit, you might try one of 2 segmented ammo offerings from CCI. They are pretty devastating on small game. #0064 is 32 grain rated at 1640fps #0074 40 grain rated at 1050fps. I don't see supersonic speeds from the #0064 out of a suppressed pistol. They make a "quiet" version #0970 that is only 710fps, but I'm not sure I would mess with it. [/QUOTE]
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