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Rifles, Reloading, Optics, Equipment
Reloading
Do you use a taper crimp on your AR-15 .223 ammo?
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<blockquote data-quote="ShtrRdy" data-source="post: 2545438" data-attributes="member: 40852"><p>I dug out the target/varmint AR to see if I could get the Hornady 60 grain V-max to shoot well out of it. I loaded up some cartridges for an "Audette velocity ladder" test as a starting point. I set the COAL to magazine length of 2.250". Using H4895 I loaded up 8 cartridges with powder weight increase of 0.2 grains per step. With a Magnetospeed hanging on the barrel I fired three on one aiming point, three on another aiming point, and two on a final aiming point. The first 6 shots combined were about 0.3" at 100 yards. The last two shots were moving away from the first six. Even though I was single feeding these I applied a taper crimp to the neck when I assembled them.</p><p></p><p>For a next step I loaded five cartridges with a charge weight that had a similar velocity, ( ~ 3005 fps ), and were within 0.2" of each other from before. The plan was to fire 2 over the chrono and 3 for a group. The first two rounds over the chrono were 3005 & 3065. The first one was as expected but why was the second shot so much higher? The 3-shot group was disappointing at 0.467" at 100 yards. I applied a crimp to these as well but i don't have a way to know if this amount of crimp was similar to the first group.</p><p></p><p>Is it possible my crimping step is causing a large difference in the way the interior Ballistics behave?</p><p></p><p>Do you apply a crimp to your AR-15 rounds?</p><p></p><p>Lapua brass</p><p>Hornady 60 gr V-max</p><p>CCI small rifle prime </p><p>24.9 gr H4895</p><p>COAL = 2.250"</p></blockquote><p></p>
[QUOTE="ShtrRdy, post: 2545438, member: 40852"] I dug out the target/varmint AR to see if I could get the Hornady 60 grain V-max to shoot well out of it. I loaded up some cartridges for an "Audette velocity ladder" test as a starting point. I set the COAL to magazine length of 2.250". Using H4895 I loaded up 8 cartridges with powder weight increase of 0.2 grains per step. With a Magnetospeed hanging on the barrel I fired three on one aiming point, three on another aiming point, and two on a final aiming point. The first 6 shots combined were about 0.3" at 100 yards. The last two shots were moving away from the first six. Even though I was single feeding these I applied a taper crimp to the neck when I assembled them. For a next step I loaded five cartridges with a charge weight that had a similar velocity, ( ~ 3005 fps ), and were within 0.2" of each other from before. The plan was to fire 2 over the chrono and 3 for a group. The first two rounds over the chrono were 3005 & 3065. The first one was as expected but why was the second shot so much higher? The 3-shot group was disappointing at 0.467" at 100 yards. I applied a crimp to these as well but i don't have a way to know if this amount of crimp was similar to the first group. Is it possible my crimping step is causing a large difference in the way the interior Ballistics behave? Do you apply a crimp to your AR-15 rounds? Lapua brass Hornady 60 gr V-max CCI small rifle prime 24.9 gr H4895 COAL = 2.250" [/QUOTE]
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Do you use a taper crimp on your AR-15 .223 ammo?
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