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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
trimming the bullet meplay for better BC
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<blockquote data-quote="Brent" data-source="post: 29646" data-attributes="member: 99"><p>Jeff,</p><p>That's too funny! <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>I take the cold "much" better than the heat, getting out shooting is much easier when it's warmer than it is now tho. At least it isn't -20 to -40 deg F or colder, that I'm thankfull for. </p><p></p><p>GPW,</p><p>I think you're asking if it does have an effect with lower extreme spreads? If so, the answer is absolutely. If BC, wind, BP and every other variable, including the rifle capable of bughole groups, the slower shot will always be lower than the faster shot, 5, 10, 15 fps or whatever, time of flight will be different and so will trajectory. </p><p></p><p>A ballistic program is the easiest way to see what effect a shot with a different MV will produce in vertical error. </p><p></p><p>This is one of the important goals in load development, not just tiny groups. 10-15 fps MV ES is what I shoot for, although some loads I have refuse to go below a solid 20-25 fps ES. Knowing the probable grouping limitation of the load is important, what ever ES you use. If the ES says vertical could be 16" at 1000 yards, and you shoot many groups with the load that go under 10", be prepared for the eventual 16" group or larger because it will happen and you can't count on the 10" groups.</p><p></p><p>POI shifts between trips to the range or field:</p><p></p><p>A more temp stable powders will also help you reduce large vertical errors from mild temp swings, very much a positive step that should be taken when shooting LR. ES should be noted at different temps for the load too, it may be quite different at one extreme or the other.</p><p></p><p>A swing in BP will also shift POI considerably at LR. Ballistic programs are usefull to understand what to expect ahead of time here too. Using the exact BP and MV on the drop chart will help in big ways at LR. This is where a ballistic program on PDA, along with a wind meter/ weather meter can give you an edge by using real time data. </p><p>Once you have established your known drops at a known BP, temp, MV and BC, matching these come ups in the ballistic program, and then modifying them with it makes things pretty simple and accurate in the field. </p><p></p><p>How close do you want POI to be to POA in the field? Well, the closer you know you can keep them to each other, and the smaller you know you can keep it grouping, these will largely determine your accurate effective range.</p><p></p><p>[ 12-01-2003: Message edited by: Brent ]</p></blockquote><p></p>
[QUOTE="Brent, post: 29646, member: 99"] Jeff, That's too funny! [img]images/icons/grin.gif[/img] I take the cold "much" better than the heat, getting out shooting is much easier when it's warmer than it is now tho. At least it isn't -20 to -40 deg F or colder, that I'm thankfull for. GPW, I think you're asking if it does have an effect with lower extreme spreads? If so, the answer is absolutely. If BC, wind, BP and every other variable, including the rifle capable of bughole groups, the slower shot will always be lower than the faster shot, 5, 10, 15 fps or whatever, time of flight will be different and so will trajectory. A ballistic program is the easiest way to see what effect a shot with a different MV will produce in vertical error. This is one of the important goals in load development, not just tiny groups. 10-15 fps MV ES is what I shoot for, although some loads I have refuse to go below a solid 20-25 fps ES. Knowing the probable grouping limitation of the load is important, what ever ES you use. If the ES says vertical could be 16" at 1000 yards, and you shoot many groups with the load that go under 10", be prepared for the eventual 16" group or larger because it will happen and you can't count on the 10" groups. POI shifts between trips to the range or field: A more temp stable powders will also help you reduce large vertical errors from mild temp swings, very much a positive step that should be taken when shooting LR. ES should be noted at different temps for the load too, it may be quite different at one extreme or the other. A swing in BP will also shift POI considerably at LR. Ballistic programs are usefull to understand what to expect ahead of time here too. Using the exact BP and MV on the drop chart will help in big ways at LR. This is where a ballistic program on PDA, along with a wind meter/ weather meter can give you an edge by using real time data. Once you have established your known drops at a known BP, temp, MV and BC, matching these come ups in the ballistic program, and then modifying them with it makes things pretty simple and accurate in the field. How close do you want POI to be to POA in the field? Well, the closer you know you can keep them to each other, and the smaller you know you can keep it grouping, these will largely determine your accurate effective range. [ 12-01-2003: Message edited by: Brent ] [/QUOTE]
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trimming the bullet meplay for better BC
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