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Long Range Hunting & Shooting
.300 Winchester Magum Bullet Choice - Expanded
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<blockquote data-quote="marc357" data-source="post: 95139" data-attributes="member: 1786"><p>I have a PACT Chrony, which I have mainly used at sea level, so let's stick with sea level data for now.</p><p></p><p>180 Balistic Tip, .507 BC, 80deg F, Zero ft Density Altitude, 3080fps 100yd zero, 1.95 inch sight height.</p><p></p><p> My USO SN-3 adjusts in Shooter's minutes, not true MOA, so all my figures are in SMOA, or IPHY (inches per hundred yards) My reticle is in SMOA, as well- rather than mildots, and I have compared holding over with dialing, and the reticle and adjustments agree.</p><p></p><p>ExBal says 26.8 SMOA @ 1000 yards</p><p>My Data Book says 31.5 SMOA @ 1000 yards</p><p></p><p>Bullet hits 47 inches lower than ExBal says.</p><p>Fudge BC down to .415, and it agrees with my data book, every hundred yards, out to 1400 yards, the furthest I have shot them. I'm not a scientist, so all I can say for sure, is these are my results, with my rifle.</p><p></p><p>After fudging the BC, I printed out drop tables from zero to 6000 ft Density altitude, and used them with good success. Hits on steel out to 1000 yards with the 6000-foot data. (I was at 3500ft altitude, but as you may know- on a hot day, the density altitude can easily be 2-3000 feet more than your actual altitude.)</p><p></p><p>Rick Jamison should be commended for publishing real BC's- as you said- no one else will.</p><p></p><p>Here are some more of his results- he was loading for 30-40 Krag, hence the low(er) velocities.</p><p></p><p>180 TSX 2390 .394</p><p>180 NBT 2382 .444</p><p>200 NAB 1975 .491</p><p></p><p>marc</p></blockquote><p></p>
[QUOTE="marc357, post: 95139, member: 1786"] I have a PACT Chrony, which I have mainly used at sea level, so let's stick with sea level data for now. 180 Balistic Tip, .507 BC, 80deg F, Zero ft Density Altitude, 3080fps 100yd zero, 1.95 inch sight height. My USO SN-3 adjusts in Shooter's minutes, not true MOA, so all my figures are in SMOA, or IPHY (inches per hundred yards) My reticle is in SMOA, as well- rather than mildots, and I have compared holding over with dialing, and the reticle and adjustments agree. ExBal says 26.8 SMOA @ 1000 yards My Data Book says 31.5 SMOA @ 1000 yards Bullet hits 47 inches lower than ExBal says. Fudge BC down to .415, and it agrees with my data book, every hundred yards, out to 1400 yards, the furthest I have shot them. I'm not a scientist, so all I can say for sure, is these are my results, with my rifle. After fudging the BC, I printed out drop tables from zero to 6000 ft Density altitude, and used them with good success. Hits on steel out to 1000 yards with the 6000-foot data. (I was at 3500ft altitude, but as you may know- on a hot day, the density altitude can easily be 2-3000 feet more than your actual altitude.) Rick Jamison should be commended for publishing real BC's- as you said- no one else will. Here are some more of his results- he was loading for 30-40 Krag, hence the low(er) velocities. 180 TSX 2390 .394 180 NBT 2382 .444 200 NAB 1975 .491 marc [/QUOTE]
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.300 Winchester Magum Bullet Choice - Expanded
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