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The Range
Rifle & Shotgun Discussion
Cutting 16" barrel to 14.5" on AR-15
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<blockquote data-quote="Garand" data-source="post: 1361555" data-attributes="member: 3498"><p>There are other things you could do to remedy this issue.. </p><p></p><p>Ammo for instance, .223 specific ammo is typically a bit slower than true 5.56 ammo because of the pressure difference in the specs.. </p><p></p><p>Take the Hornady TAP ammo as an example. Hornady produces this round in both 223 Rem, and 5.56mm </p><p></p><p>So if you were shooting this "223" ammo out of a 14.5" barrel you'd be nearly 200fps off what the 5.56(which the ACOG was likely configured with) is throwing.</p><p></p><p>Long story short, when you're dealing with BDC reticles you need to be shooting a round at the same velocity as the BDC was calculated to use irregardless of the rifle barrel length.</p><p></p><p>[ATTACH=full]81664[/ATTACH]</p><p></p><p>[ATTACH=full]81665[/ATTACH]</p><p></p><p>[ATTACH=full]81666[/ATTACH]</p><p></p><p>Here's where all this data comes in to play.. </p><p></p><p><em>"The Hornady 75 grain bullets are considered to have a fragmentation threshold of 2200 fps +/- 50 fps. Based on the conservative figure of 2250 fps the table below shows the range (in yards) at which fragmentation can be expected to occur for the two loads being tested. It also shows the gain (in yards) before reaching the fragmentation threshold for the 5.56 TAP load. "</em></p><p></p><p>Thats quite a bit of difference in range that you get the full potential of the projectile.</p><p>[ATTACH=full]81667[/ATTACH]</p></blockquote><p></p>
[QUOTE="Garand, post: 1361555, member: 3498"] There are other things you could do to remedy this issue.. Ammo for instance, .223 specific ammo is typically a bit slower than true 5.56 ammo because of the pressure difference in the specs.. Take the Hornady TAP ammo as an example. Hornady produces this round in both 223 Rem, and 5.56mm So if you were shooting this "223" ammo out of a 14.5" barrel you'd be nearly 200fps off what the 5.56(which the ACOG was likely configured with) is throwing. Long story short, when you're dealing with BDC reticles you need to be shooting a round at the same velocity as the BDC was calculated to use irregardless of the rifle barrel length. [attach=full]81664[/attach] [attach=full]81665[/attach] [attach=full]81666[/attach] Here's where all this data comes in to play.. [I]"The Hornady 75 grain bullets are considered to have a fragmentation threshold of 2200 fps +/- 50 fps. Based on the conservative figure of 2250 fps the table below shows the range (in yards) at which fragmentation can be expected to occur for the two loads being tested. It also shows the gain (in yards) before reaching the fragmentation threshold for the 5.56 TAP load. "[/I] Thats quite a bit of difference in range that you get the full potential of the projectile. [attach=full]81667[/attach] [/QUOTE]
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The Range
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Cutting 16" barrel to 14.5" on AR-15
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