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Rifles, Reloading, Optics, Equipment
Reloading
Weighing Cases for Quickload
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<blockquote data-quote="Wyo7200" data-source="post: 1052515" data-attributes="member: 82337"><p>Bill, Chris long has identified a range of nodes for each barrels lengths, so you are essentially matching your components to the barrels harmonics. It can be found <a href="http://www.the-long-family.com/OBT%20Table.pdf" target="_blank">here</a> </p><p></p><p>My accurate loads BT have come within 2-3% of a node listed in Chris's table.</p><p></p><p>Other bullet combinations, for example, heavier bullets may overlap on some nodes, but most will likely fall near the slower timed nodes. Lighter bullets will be closer to the faster timed nodes. Each combination (most) will have 2-3 nodes that you can identify if your inputs into QL are precise.</p><p></p><p>QL has a feature that you can search combinations by barrel time, and see how other powders compare for your selected components. Always refer to published data and verify charges. Be careful. Here is an example, using my components- Yours will most certainly be different:</p><p></p><p>[code]Cartridge : .25-06 Rem.</p><p>Bullet : .257, 110, Nosler AccuBond 53742</p><p>Useable Case Capaci: 61.720 grain H2O = 4.007 cm³</p><p>Cartridge O.A.L. L6: 3.200 inch = 81.28 mm</p><p>Barrel Length : [B][U]24.0 inch[/U][/B] = 609.6 mm</p><p></p><p>Predicted Data for Indicated Charges of the Following Powders.</p><p>Matching Barrel Time: 1.227 milliseconds</p><p>[B][COLOR="red"]These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.</p><p>C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested</p><p>loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand</p><p>that all of the listed powders can be unsuitable for the given combination of cartridge, bullet</p><p>and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.</p><p>USE ONLY FOR COMPARISON ![/COLOR][/B]</p><p></p><p>66 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.</p><p>Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time</p><p> % Grains Gramm fps % psi psi ms</p><p>--------------------------------- -----------------------------------------------------------------</p><p>Vihtavuori N570 104.4 62.6 4.06 3106 91.4 49816 14303 1.226</p><p>Alliant Reloder-33 105.0 65.6 4.25 3092 91.9 49963 14147 1.227</p><p>Norma MRP 2 103.8 59.1 3.83 3092 96.9 50660 13414 1.227</p><p>Hodgdon Retumbo 107.3 61.4 3.98 3090 99.1 49169 13451 1.227</p><p>Norma MRP 93.6 55.5 3.60 3087 98.7 50307 13141 1.227</p><p>Alliant Reloder-25 100.5 56.9 3.69 3077 99.8 49354 12795 1.227</p><p>Accurate MAGPRO 95.8 57.9 3.75 3065 94.1 50643 13259 1.227</p><p>Vihtavuori N560 94.8 55.1 3.57 3063 95.4 49790 13174 1.227</p><p>Winchester WXR 97.9 55.1 3.57 3054 97.4 50373 12828 1.227</p><p>Alliant Reloder-22 95.3 54.8 3.55 3054 97.5 50260 12821 1.228</p><p>Accurate 4350 88.2 50.2 3.25 3041 100.0 52838 11671 1.227</p><p>Alliant Reloder-17 83.1 49.6 3.21 3041 100.0 49825 11712 1.227</p><p>IMR 7828 98.5 54.5 3.53 3036 95.7 48792 12769 1.227</p><p>IMR 7828 SSC 93.2 54.5 3.53 3036 95.7 48792 12769 1.227[/code]</p></blockquote><p></p>
[QUOTE="Wyo7200, post: 1052515, member: 82337"] Bill, Chris long has identified a range of nodes for each barrels lengths, so you are essentially matching your components to the barrels harmonics. It can be found [URL="http://www.the-long-family.com/OBT%20Table.pdf"]here[/URL] My accurate loads BT have come within 2-3% of a node listed in Chris's table. Other bullet combinations, for example, heavier bullets may overlap on some nodes, but most will likely fall near the slower timed nodes. Lighter bullets will be closer to the faster timed nodes. Each combination (most) will have 2-3 nodes that you can identify if your inputs into QL are precise. QL has a feature that you can search combinations by barrel time, and see how other powders compare for your selected components. Always refer to published data and verify charges. Be careful. Here is an example, using my components- Yours will most certainly be different: [code]Cartridge : .25-06 Rem. Bullet : .257, 110, Nosler AccuBond 53742 Useable Case Capaci: 61.720 grain H2O = 4.007 cm³ Cartridge O.A.L. L6: 3.200 inch = 81.28 mm Barrel Length : [B][U]24.0 inch[/U][/B] = 609.6 mm Predicted Data for Indicated Charges of the Following Powders. Matching Barrel Time: 1.227 milliseconds [B][COLOR="red"]These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window. C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand that all of the listed powders can be unsuitable for the given combination of cartridge, bullet and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations. USE ONLY FOR COMPARISON ![/COLOR][/B] 66 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped. Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time % Grains Gramm fps % psi psi ms --------------------------------- ----------------------------------------------------------------- Vihtavuori N570 104.4 62.6 4.06 3106 91.4 49816 14303 1.226 Alliant Reloder-33 105.0 65.6 4.25 3092 91.9 49963 14147 1.227 Norma MRP 2 103.8 59.1 3.83 3092 96.9 50660 13414 1.227 Hodgdon Retumbo 107.3 61.4 3.98 3090 99.1 49169 13451 1.227 Norma MRP 93.6 55.5 3.60 3087 98.7 50307 13141 1.227 Alliant Reloder-25 100.5 56.9 3.69 3077 99.8 49354 12795 1.227 Accurate MAGPRO 95.8 57.9 3.75 3065 94.1 50643 13259 1.227 Vihtavuori N560 94.8 55.1 3.57 3063 95.4 49790 13174 1.227 Winchester WXR 97.9 55.1 3.57 3054 97.4 50373 12828 1.227 Alliant Reloder-22 95.3 54.8 3.55 3054 97.5 50260 12821 1.228 Accurate 4350 88.2 50.2 3.25 3041 100.0 52838 11671 1.227 Alliant Reloder-17 83.1 49.6 3.21 3041 100.0 49825 11712 1.227 IMR 7828 98.5 54.5 3.53 3036 95.7 48792 12769 1.227 IMR 7828 SSC 93.2 54.5 3.53 3036 95.7 48792 12769 1.227[/code] [/QUOTE]
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