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243 AI Load Data Help Needed
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<blockquote data-quote="Wyo7200" data-source="post: 1044411" data-attributes="member: 82337"><p>"Where should I start with a load and which powder would anyone recommend to start with?" </p><p></p><p>I'd recommend using the slowest powder that fills the case the most. Your 24" barrel has OBT nodes in ms:</p><p>0.8160 0.8948 1.0221 1.1016 1.2282 1.3084 1.4343</p><p></p><p>Try to get within 2-3% of them and you should get excellent accuracy. The gun) is at an estimated charge that will get you on or close to a node. The third node is very high pressure and for safety, Id rather not post it- You will probably -kaboom- trying to reach the next node with H322.- We can fine tune if you get velocity data- even if its a mild charge.</p><p></p><p></p><p>"or can I start with standard 243 loads and work up from them as starting points?"</p><p>- <strong>PLEASE do not skip the safe work up procedures. Always start low and work up using published data and checking for pressure signs. Anyone reading this, please take the below as it is- estimates which may not be true in the real world. Use the below as a a reference to help you choose which powder you'd like to use.</strong></p><p></p><p>H322:</p><p>Cartridge : .243 Ackley Imp</p><p>Bullet : .243, 85, Barnes 'TSX' BT 30212</p><p>Useable Case Capaci: 51.404 grain H2O = 3.338 cm³</p><p>Cartridge O.A.L. L6: 2.620 inch = 66.55 mm</p><p>Barrel Length : 24.0 inch = 609.6 mm</p><p>Powder : Hodgdon H322</p><p></p><p>Predicted data by increasing and decreasing the given charge,</p><p>incremented in steps of 1.0% of nominal charge.</p><p>CAUTION: Figures exceed maximum and minimum recommended loads !</p><p></p><p>Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time</p><p> % % Grains fps ft.lbs psi psi % ms</p><p></p><p>-10.0 65 29.70 2716 1392 33954 8283 99.6 1.348</p><p>-09.0 65 30.03 2740 1417 34770 8353 99.7 1.336</p><p>-08.0 66 30.36 2763 1441 35603 8421 99.8 1.324</p><p>-07.0 67 30.69 2787 1466 36454 8486 99.9 1.312</p><p>gun)-06.0 67 31.02 2810 1490 37323 8549 99.9 1.300gun)</p><p>-05.0 68 31.35 2833 1515 38211 8610 100.0 1.289</p><p>-04.0 69 31.68 2856 1539 39116 8667 100.0 1.277</p><p>-03.0 70 32.01 2878 1564 40041 8723 100.0 1.266</p><p>-02.0 70 32.34 2901 1589 40984 8778 100.0 1.254</p><p>-01.0 71 32.67 2924 1613 41947 8832 100.0 1.243</p><p>+00.0 72 33.00 2946 1638 42930 8887 100.0 1.232</p><p>gun)+01.0 72 33.33 2968 1663 43933 8940 100.0 1.221gun)</p><p>+02.0 73 33.66 2990 1687 44957 8994 100.0 1.211</p><p>+03.0 74 33.99 3012 1712 46001 9047 100.0 1.200</p><p>+04.0 75 34.32 3034 1737 47067 9100 100.0 1.190 ! Near Maximum !</p><p>+05.0 75 34.65 3055 1762 48154 9153 100.0 1.179 ! Near Maximum !</p><p></p><p>Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge</p><p>Data for burning rate increased by 10% relative to nominal value:</p><p>+Ba 72 33.00 3035 1739 49296 8641 100.0 1.172 ! Near Maximum !</p><p>Data for burning rate decreased by 10% relative to nominal value:</p><p>-Ba 72 33.00 2814 1494 36536 9055 98.6 1.309</p><p></p><p>and H4350:</p><p></p><p>Cartridge : .243 Ackley Imp</p><p>Bullet : .243, 85, Barnes 'TSX' BT 30212</p><p>Useable Case Capaci: 51.404 grain H2O = 3.338 cm³</p><p>Cartridge O.A.L. L6: 2.620 inch = 66.55 mm</p><p>Barrel Length : 24.0 inch = 609.6 mm</p><p>Powder : Hodgdon H4350</p><p></p><p>Predicted data by increasing and decreasing the given charge,</p><p>incremented in steps of 1.0% of nominal charge.</p><p>CAUTION: Figures exceed maximum and minimum recommended loads !</p><p></p><p>Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time</p><p> % % Grains fps ft.lbs psi psi % ms</p><p></p><p>-10.0 80 37.08 2702 1378 33556 8936 89.2 1.352</p><p>-09.0 81 37.49 2730 1406 34477 9060 89.7 1.339</p><p>-08.0 82 37.90 2758 1435 35422 9183 90.2 1.325</p><p>-07.0 83 38.32 2786 1465 36389 9304 90.8 1.312</p><p>gun)-06.0 84 38.73 2814 1494 37377 9424 91.3 1.298gun)</p><p>-05.0 84 39.14 2842 1524 38387 9543 91.8 1.285</p><p>-04.0 85 39.55 2870 1554 39421 9660 92.2 1.273</p><p>-03.0 86 39.96 2898 1585 40477 9775 92.7 1.260</p><p>-02.0 87 40.38 2926 1616 41558 9888 93.2 1.247</p><p>-01.0 88 40.79 2954 1647 42668 10000 93.6 1.235</p><p>gun)+00.0 89 41.20 2982 1678 43808 10110 94.0 1.222gun)</p><p>+01.0 90 41.61 3010 1710 44980 10218 94.4 1.210</p><p>+02.0 91 42.02 3038 1742 46184 10323 94.8 1.198</p><p>+03.0 92 42.44 3066 1774 47420 10427 95.2 1.186 ! Near Maximum !</p><p>+04.0 92 42.85 3094 1807 48691 10528 95.6 1.174 ! Near Maximum !</p><p>+05.0 93 43.26 3122 1839 49996 10627 96.0 1.162 ! Near Maximum !</p><p></p><p>Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge</p><p>Data for burning rate increased by 10% relative to nominal value:</p><p>+Ba 89 41.20 3135 1855 51016 10347 98.5 1.153 ! Near Maximum !</p><p>Data for burning rate decreased by 10% relative to nominal value:</p><p>-Ba 89 41.20 2794 1473 36641 9471 86.4 1.320</p><p></p><p></p><p>If you have any of these powders, you'd be in business:</p><p></p><p>42 loads produced a Loading Ratio below user-defined minimum of 75%. 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>Alliant Reloder-25 100.9 47.6 3.08 3103 96.6 42806 11747 1.222</p><p>IMR 7828 98.8 45.5 2.95 3045 89.8 42543 11260 1.222</p><p>Winchester WXR 98.3 46.1 2.99 3081 92.6 43669 11495 1.222</p><p>Vihtavuori N165 98.2 46.0 2.98 3014 93.8 44485 10399 1.222</p><p>Vihtavuori N160 97.4 44.3 2.87 2979 91.2 44422 10108 1.222</p><p>Hodgdon H4831 97.1 44.7 2.90 2998 89.6 43440 10519 1.222</p><p>Accurate MAGPRO 96.3 48.5 3.14 3077 88.0 43724 11670 1.222</p><p>Ramshot Magnum 96.3 49.7 3.22 3046 93.2 43066 11163 1.222</p><p>Alliant Reloder-22 95.7 45.9 2.97 3082 92.8 43594 11501 1.222</p><p>Vihtavuori N560 95.1 46.1 2.98 3078 89.7 43177 11646 1.222</p><p>Norma MRP 94.0 46.5 3.01 3113 94.5 43331 11890 1.222</p><p>IMR 7828 SSC 93.4 45.5 2.95 3045 89.8 42543 11260 1.222</p><p>Hodgdon H4831 SC 93.4 44.7 2.90 2998 89.6 43440 10519 1.222</p><p>IMR 4831 93.0 42.2 2.73 3071 98.3 45787 10607 1.222</p><p>Alliant Reloder-19 91.9 43.6 2.82 3039 92.7 43657 10873 1.222</p><p>Winchester Supreme 780 91.8 45.9 2.97 3005 92.7 44051 10442 1.222</p><p>Hodgdon Hybrid 100V 89.7 41.1 2.67 3024 99.1 43647 10062 1.223</p><p>Hodgdon H4350 88.8 41.2 2.67 2981 94.0 43766 10106 1.223</p><p>Accurate 4350 88.8 42.1 2.73 3102 98.3 46571 10908 1.223</p><p>Ramshot Hunter 88.1 43.1 2.79 3062 96.0 44179 10907 1.222</p><p>Vihtavuori N150 87.8 39.3 2.54 2994 99.9 45304 9483 1.222</p><p>Norma URP 87.4 40.9 2.65 3051 97.7 44128 10658 1.223</p><p>Norma 204 87.3 42.7 2.77 3018 92.4 43774 10594 1.222</p><p>IMR 4350 87.2 41.1 2.66 2981 94.1 43758 10096 1.223</p><p>Vihtavuori N550 85.1 41.2 2.67 3059 97.7 44744 10757 1.223</p><p>Vihtavuori N135 84.3 36.2 2.35 2987 100.0 45965 8769 1.223</p><p>Hodgdon H414 83.2 41.7 2.70 3060 95.1 44529 10872 1.222</p><p>Winchester 760 83.2 41.7 2.70 3060 95.1 44529 10872 1.222</p><p>Accurate 2700 83.1 41.1 2.66 2952 94.6 45367 9594 1.223</p><p>IMR 4007 SSC 82.7 39.7 2.57 2991 94.6 45057 10100 1.222</p><p>Alliant Reloder-17 82.7 41.1 2.66 3077 99.1 42286 10964 1.223</p><p>Norma 203 old 82.1 39.3 2.55 3061 99.7 46452 10209 1.223</p><p>IMR 4064 81.5 36.5 2.36 2979 98.5 44146 9643 1.222</p><p>Hodgdon H380 81.1 39.3 2.54 3031 97.6 45388 10302 1.222</p><p>Hodgdon VARGET 80.6 37.0 2.40 2972 98.2 43625 9708 1.223</p></blockquote><p></p>
[QUOTE="Wyo7200, post: 1044411, member: 82337"] "Where should I start with a load and which powder would anyone recommend to start with?" I'd recommend using the slowest powder that fills the case the most. Your 24" barrel has OBT nodes in ms: 0.8160 0.8948 1.0221 1.1016 1.2282 1.3084 1.4343 Try to get within 2-3% of them and you should get excellent accuracy. The gun) is at an estimated charge that will get you on or close to a node. The third node is very high pressure and for safety, Id rather not post it- You will probably -kaboom- trying to reach the next node with H322.- We can fine tune if you get velocity data- even if its a mild charge. "or can I start with standard 243 loads and work up from them as starting points?" - [B]PLEASE do not skip the safe work up procedures. Always start low and work up using published data and checking for pressure signs. Anyone reading this, please take the below as it is- estimates which may not be true in the real world. Use the below as a a reference to help you choose which powder you'd like to use.[/B] H322: Cartridge : .243 Ackley Imp Bullet : .243, 85, Barnes 'TSX' BT 30212 Useable Case Capaci: 51.404 grain H2O = 3.338 cm³ Cartridge O.A.L. L6: 2.620 inch = 66.55 mm Barrel Length : 24.0 inch = 609.6 mm Powder : Hodgdon H322 Predicted data by increasing and decreasing the given charge, incremented in steps of 1.0% of nominal charge. CAUTION: Figures exceed maximum and minimum recommended loads ! Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time % % Grains fps ft.lbs psi psi % ms -10.0 65 29.70 2716 1392 33954 8283 99.6 1.348 -09.0 65 30.03 2740 1417 34770 8353 99.7 1.336 -08.0 66 30.36 2763 1441 35603 8421 99.8 1.324 -07.0 67 30.69 2787 1466 36454 8486 99.9 1.312 gun)-06.0 67 31.02 2810 1490 37323 8549 99.9 1.300gun) -05.0 68 31.35 2833 1515 38211 8610 100.0 1.289 -04.0 69 31.68 2856 1539 39116 8667 100.0 1.277 -03.0 70 32.01 2878 1564 40041 8723 100.0 1.266 -02.0 70 32.34 2901 1589 40984 8778 100.0 1.254 -01.0 71 32.67 2924 1613 41947 8832 100.0 1.243 +00.0 72 33.00 2946 1638 42930 8887 100.0 1.232 gun)+01.0 72 33.33 2968 1663 43933 8940 100.0 1.221gun) +02.0 73 33.66 2990 1687 44957 8994 100.0 1.211 +03.0 74 33.99 3012 1712 46001 9047 100.0 1.200 +04.0 75 34.32 3034 1737 47067 9100 100.0 1.190 ! Near Maximum ! +05.0 75 34.65 3055 1762 48154 9153 100.0 1.179 ! Near Maximum ! Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge Data for burning rate increased by 10% relative to nominal value: +Ba 72 33.00 3035 1739 49296 8641 100.0 1.172 ! Near Maximum ! Data for burning rate decreased by 10% relative to nominal value: -Ba 72 33.00 2814 1494 36536 9055 98.6 1.309 and H4350: Cartridge : .243 Ackley Imp Bullet : .243, 85, Barnes 'TSX' BT 30212 Useable Case Capaci: 51.404 grain H2O = 3.338 cm³ Cartridge O.A.L. L6: 2.620 inch = 66.55 mm Barrel Length : 24.0 inch = 609.6 mm Powder : Hodgdon H4350 Predicted data by increasing and decreasing the given charge, incremented in steps of 1.0% of nominal charge. CAUTION: Figures exceed maximum and minimum recommended loads ! Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time % % Grains fps ft.lbs psi psi % ms -10.0 80 37.08 2702 1378 33556 8936 89.2 1.352 -09.0 81 37.49 2730 1406 34477 9060 89.7 1.339 -08.0 82 37.90 2758 1435 35422 9183 90.2 1.325 -07.0 83 38.32 2786 1465 36389 9304 90.8 1.312 gun)-06.0 84 38.73 2814 1494 37377 9424 91.3 1.298gun) -05.0 84 39.14 2842 1524 38387 9543 91.8 1.285 -04.0 85 39.55 2870 1554 39421 9660 92.2 1.273 -03.0 86 39.96 2898 1585 40477 9775 92.7 1.260 -02.0 87 40.38 2926 1616 41558 9888 93.2 1.247 -01.0 88 40.79 2954 1647 42668 10000 93.6 1.235 gun)+00.0 89 41.20 2982 1678 43808 10110 94.0 1.222gun) +01.0 90 41.61 3010 1710 44980 10218 94.4 1.210 +02.0 91 42.02 3038 1742 46184 10323 94.8 1.198 +03.0 92 42.44 3066 1774 47420 10427 95.2 1.186 ! Near Maximum ! +04.0 92 42.85 3094 1807 48691 10528 95.6 1.174 ! Near Maximum ! +05.0 93 43.26 3122 1839 49996 10627 96.0 1.162 ! Near Maximum ! Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge Data for burning rate increased by 10% relative to nominal value: +Ba 89 41.20 3135 1855 51016 10347 98.5 1.153 ! Near Maximum ! Data for burning rate decreased by 10% relative to nominal value: -Ba 89 41.20 2794 1473 36641 9471 86.4 1.320 If you have any of these powders, you'd be in business: 42 loads produced a Loading Ratio below user-defined minimum of 75%. 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 --------------------------------- ----------------------------------------------------------------- Alliant Reloder-25 100.9 47.6 3.08 3103 96.6 42806 11747 1.222 IMR 7828 98.8 45.5 2.95 3045 89.8 42543 11260 1.222 Winchester WXR 98.3 46.1 2.99 3081 92.6 43669 11495 1.222 Vihtavuori N165 98.2 46.0 2.98 3014 93.8 44485 10399 1.222 Vihtavuori N160 97.4 44.3 2.87 2979 91.2 44422 10108 1.222 Hodgdon H4831 97.1 44.7 2.90 2998 89.6 43440 10519 1.222 Accurate MAGPRO 96.3 48.5 3.14 3077 88.0 43724 11670 1.222 Ramshot Magnum 96.3 49.7 3.22 3046 93.2 43066 11163 1.222 Alliant Reloder-22 95.7 45.9 2.97 3082 92.8 43594 11501 1.222 Vihtavuori N560 95.1 46.1 2.98 3078 89.7 43177 11646 1.222 Norma MRP 94.0 46.5 3.01 3113 94.5 43331 11890 1.222 IMR 7828 SSC 93.4 45.5 2.95 3045 89.8 42543 11260 1.222 Hodgdon H4831 SC 93.4 44.7 2.90 2998 89.6 43440 10519 1.222 IMR 4831 93.0 42.2 2.73 3071 98.3 45787 10607 1.222 Alliant Reloder-19 91.9 43.6 2.82 3039 92.7 43657 10873 1.222 Winchester Supreme 780 91.8 45.9 2.97 3005 92.7 44051 10442 1.222 Hodgdon Hybrid 100V 89.7 41.1 2.67 3024 99.1 43647 10062 1.223 Hodgdon H4350 88.8 41.2 2.67 2981 94.0 43766 10106 1.223 Accurate 4350 88.8 42.1 2.73 3102 98.3 46571 10908 1.223 Ramshot Hunter 88.1 43.1 2.79 3062 96.0 44179 10907 1.222 Vihtavuori N150 87.8 39.3 2.54 2994 99.9 45304 9483 1.222 Norma URP 87.4 40.9 2.65 3051 97.7 44128 10658 1.223 Norma 204 87.3 42.7 2.77 3018 92.4 43774 10594 1.222 IMR 4350 87.2 41.1 2.66 2981 94.1 43758 10096 1.223 Vihtavuori N550 85.1 41.2 2.67 3059 97.7 44744 10757 1.223 Vihtavuori N135 84.3 36.2 2.35 2987 100.0 45965 8769 1.223 Hodgdon H414 83.2 41.7 2.70 3060 95.1 44529 10872 1.222 Winchester 760 83.2 41.7 2.70 3060 95.1 44529 10872 1.222 Accurate 2700 83.1 41.1 2.66 2952 94.6 45367 9594 1.223 IMR 4007 SSC 82.7 39.7 2.57 2991 94.6 45057 10100 1.222 Alliant Reloder-17 82.7 41.1 2.66 3077 99.1 42286 10964 1.223 Norma 203 old 82.1 39.3 2.55 3061 99.7 46452 10209 1.223 IMR 4064 81.5 36.5 2.36 2979 98.5 44146 9643 1.222 Hodgdon H380 81.1 39.3 2.54 3031 97.6 45388 10302 1.222 Hodgdon VARGET 80.6 37.0 2.40 2972 98.2 43625 9708 1.223 [/QUOTE]
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