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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficient tests...
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<blockquote data-quote="entoptics" data-source="post: 2614649" data-attributes="member: 104268"><p>1) Nothing personal, but this type of response is why some people don't trust things said on the internet....</p><p></p><p>2) Incorrect. Because the B.C. affects the entire flight, a 3000 fps muzzle velocity rapidly becomes a <<<3000 fps as the drag slows the bullet down. Also, for reasons I don't fully understand, and personally find counterintuitive, time of flight has little bearing on wind drift compared to B.C.</p><p></p><p>2 scenarios below, run through JBM Ballistics. Standard atmosphere, 10 mph wind.</p><p></p><p>153 A-Tip, 2700 fps. 500 yards. 0.632 seconds flight time. Wind drift 13.6". 1000 yards, 1.466 seconds flight time, wind drift 62.8"</p><p></p><p>124 HH, 3000 fps. 500 yards. 0.620 sec flight time. Wind drift 21.4". 1000 yards, 1.614 sec flight time, wind drift 108.5"</p><p></p><p>At 500 yards, the A-tip has slightly MORE flight time, but 64% of the wind drift of the 124 HH. At 1000 yards, the flight time is less than the 124HH (90%), but the A-tip has 57% of the 124 HH wind drift.</p><p></p><p>Wind drift for the slower A-Tip is less than that for the 124 HH <u><em>from the muzzle onward.</em></u> Let me repeat that. The higher B.C. bullet drifts less from the start, and only gains more advantage as it goes down range.</p><p></p><p>Also, the A-Tip passed the 124HH in velocity at 330 yards. From there on out, it has FAR more energy (heavier), and the velocity/wind/energy gap will only widen as it travels down range.</p><p></p><p>3) Incorrect. By your own example "BC <em><u>does</u></em> start to play into trajectory by <s> 500 </s> 330yards and beyond". Indeed, ~9" of wind for the 124HH and only 6" for the 153 A-Tip at 330.</p><p></p><p></p><p></p><p>I'm not sure you realize, but the 124 HH, with the carefully circled and highlighted "Calculated" was the bullet that performed the furthest from advertised in my experiments. Indeed, all of the Hammer bullets I tested were labeled as "Calculated from shot drops" on the website.</p><p></p><p><em>The fact is, B.C. starts to come into play depending on each individual's needs. 44 mag carbine on deer? 375 Cheytac on steel? There's no rule of thumb, let alone hard and fast number. <em>Suggesting the only way to figure this out is to "try after you buy" is disheartening.</em></em></p><p></p><p>Edited to avoid the % less vs % of sloppiness in language [USER=14204]@FEENIX[/USER] and [USER=94491]@cohunt[/USER] justifiably corrected me on, and I still used again...</p></blockquote><p></p>
[QUOTE="entoptics, post: 2614649, member: 104268"] 1) Nothing personal, but this type of response is why some people don't trust things said on the internet.... 2) Incorrect. Because the B.C. affects the entire flight, a 3000 fps muzzle velocity rapidly becomes a <<<3000 fps as the drag slows the bullet down. Also, for reasons I don't fully understand, and personally find counterintuitive, time of flight has little bearing on wind drift compared to B.C. 2 scenarios below, run through JBM Ballistics. Standard atmosphere, 10 mph wind. 153 A-Tip, 2700 fps. 500 yards. 0.632 seconds flight time. Wind drift 13.6". 1000 yards, 1.466 seconds flight time, wind drift 62.8" 124 HH, 3000 fps. 500 yards. 0.620 sec flight time. Wind drift 21.4". 1000 yards, 1.614 sec flight time, wind drift 108.5" At 500 yards, the A-tip has slightly MORE flight time, but 64% of the wind drift of the 124 HH. At 1000 yards, the flight time is less than the 124HH (90%), but the A-tip has 57% of the 124 HH wind drift. Wind drift for the slower A-Tip is less than that for the 124 HH [U][I]from the muzzle onward.[/I][/U] Let me repeat that. The higher B.C. bullet drifts less from the start, and only gains more advantage as it goes down range. Also, the A-Tip passed the 124HH in velocity at 330 yards. From there on out, it has FAR more energy (heavier), and the velocity/wind/energy gap will only widen as it travels down range. 3) Incorrect. By your own example "BC [I][U]does[/U][/I] start to play into trajectory by [S] 500 [/S] 330yards and beyond". Indeed, ~9" of wind for the 124HH and only 6" for the 153 A-Tip at 330. I'm not sure you realize, but the 124 HH, with the carefully circled and highlighted "Calculated" was the bullet that performed the furthest from advertised in my experiments. Indeed, all of the Hammer bullets I tested were labeled as "Calculated from shot drops" on the website. [I]The fact is, B.C. starts to come into play depending on each individual's needs. 44 mag carbine on deer? 375 Cheytac on steel? There's no rule of thumb, let alone hard and fast number. [I]Suggesting the only way to figure this out is to "try after you buy" is disheartening.[/I][/I] Edited to avoid the % less vs % of sloppiness in language [USER=14204]@FEENIX[/USER] and [USER=94491]@cohunt[/USER] justifiably corrected me on, and I still used again... [/QUOTE]
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Hammer ballistic coefficient tests...
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