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Rifles, Reloading, Optics, Equipment
Reloading
280 ai speed
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<blockquote data-quote="Ridgerunner665" data-source="post: 1078848" data-attributes="member: 12660"><p>I finally got some shooting done with my 280 Ackley (24" barrel), thought I'd revisit this...below is actual chrono data, followed by a dialed in QuickLoad rundown (matched to my rifle)</p><p></p><p>150 ABLR, Norma MRP</p><p></p><p>60.5 = 3,043 fps</p><p>61 = 3,070</p><p>61.5 = 3,093 fps</p><p>62 = 3,120 fps</p><p>62.5 = 3,137 fps (too hot, do not use)</p><p>63 = 3,167 fps (too hot, do not use)</p><p>63.5 = 3,192 fps (way too hot, ejector mark, do not use)</p><p></p><p>[code]Cartridge : .280 Ack Imp</p><p>Bullet : .284, 150, Nosler Accubond LR 58734 G7</p><p>Useable Case Capaci: 65.441 grain H2O = 4.249 cm³</p><p>Cartridge O.A.L. L6: 3.340 inch = 84.84 mm</p><p>Barrel Length : 24.0 inch = 609.6 mm</p><p>Powder : Norma MRP ?</p><p></p><p>Predicted data by increasing and decreasing the given charge,</p><p>incremented in steps of 0.807% 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>-08.1 91 57.00 2877 2758 48705 11742 99.6 1.277</p><p>-07.3 91 57.50 2902 2806 50071 11808 99.7 1.261</p><p>-06.5 92 58.00 2927 2854 51474 11870 99.8 1.245</p><p>-05.6 93 58.50 2952 2902 52916 11928 99.9 1.230</p><p>-04.8 94 59.00 2976 2951 54397 11981 100.0 1.214</p><p>-04.0 95 59.50 3001 2999 55920 12030 100.0 1.199 ! Near Maximum !</p><p>-03.2 95 60.00 3025 3048 57486 12075 100.0 1.184 ! Near Maximum !</p><p>-02.4 96 60.50 3049 3097 59095 12117 100.0 1.170 ! Near Maximum !</p><p>-01.6 97 61.00 3074 3147 60750 12159 100.0 1.155 ! Near Maximum !</p><p>-00.8 98 61.50 3098 3196 62452 12200 100.0 1.141 ! Near Maximum !</p><p>+00.0 98 62.00 3122 3246 64202 12240 100.0 1.127 ! Near Maximum !</p><p>+00.8 99 62.50 3146 3296 66003 12280 100.0 1.113 !DANGEROUS LOAD-DO NOT USE!</p><p>+01.6 100 63.00 3169 3346 67855 12319 100.0 1.100 !DANGEROUS LOAD-DO NOT USE!</p><p>+02.4 101 63.50 3193 3396 69760 12358 100.0 1.086 !DANGEROUS LOAD-DO NOT USE!</p><p>+03.2 102 64.00 3217 3446 71722 12395 100.0 1.073 !DANGEROUS LOAD-DO NOT USE!</p><p>+04.0 102 64.50 3240 3497 73741 12433 100.0 1.060 !DANGEROUS LOAD-DO NOT USE!</p><p></p><p>Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge</p><p>Data for burning rate increased by 5% relative to nominal value:</p><p>+Ba 98 62.00 3187 3383 71171 11987 100.0 1.081 !DANGEROUS LOAD-DO NOT USE!</p><p>Data for burning rate decreased by 5% relative to nominal value:</p><p>-Ba 98 62.00 3040 3079 57314 12509 99.8 1.181 ! Near Maximum !</p><p> [/code]</p><p></p><p>First try at a group with the 150 ABLR's (62 grains of MRP)...shows promise I think.</p><p><a href="http://s217.photobucket.com/user/Ridgerunner665/media/TgtGfx%20150%20ablr_zps9kl69jiv.jpg.html" target="_blank"><img src="http://i217.photobucket.com/albums/cc137/Ridgerunner665/TgtGfx%20150%20ablr_zps9kl69jiv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Also...</p><p></p><p>160 Accubond, Norma MRP </p><p></p><p>58.5 = 2,956 fps</p><p>59 = 2,972 fps</p><p>59.5 = 2,989 fps</p><p>60 = 3,003 fps, no signs of pressure but a dialed in QuickLoad says 60.5 is maxed out at 3,027 fps, so I'm not chasing this one any further.</p></blockquote><p></p>
[QUOTE="Ridgerunner665, post: 1078848, member: 12660"] I finally got some shooting done with my 280 Ackley (24" barrel), thought I'd revisit this...below is actual chrono data, followed by a dialed in QuickLoad rundown (matched to my rifle) 150 ABLR, Norma MRP 60.5 = 3,043 fps 61 = 3,070 61.5 = 3,093 fps 62 = 3,120 fps 62.5 = 3,137 fps (too hot, do not use) 63 = 3,167 fps (too hot, do not use) 63.5 = 3,192 fps (way too hot, ejector mark, do not use) [code]Cartridge : .280 Ack Imp Bullet : .284, 150, Nosler Accubond LR 58734 G7 Useable Case Capaci: 65.441 grain H2O = 4.249 cm³ Cartridge O.A.L. L6: 3.340 inch = 84.84 mm Barrel Length : 24.0 inch = 609.6 mm Powder : Norma MRP ? Predicted data by increasing and decreasing the given charge, incremented in steps of 0.807% 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 -08.1 91 57.00 2877 2758 48705 11742 99.6 1.277 -07.3 91 57.50 2902 2806 50071 11808 99.7 1.261 -06.5 92 58.00 2927 2854 51474 11870 99.8 1.245 -05.6 93 58.50 2952 2902 52916 11928 99.9 1.230 -04.8 94 59.00 2976 2951 54397 11981 100.0 1.214 -04.0 95 59.50 3001 2999 55920 12030 100.0 1.199 ! Near Maximum ! -03.2 95 60.00 3025 3048 57486 12075 100.0 1.184 ! Near Maximum ! -02.4 96 60.50 3049 3097 59095 12117 100.0 1.170 ! Near Maximum ! -01.6 97 61.00 3074 3147 60750 12159 100.0 1.155 ! Near Maximum ! -00.8 98 61.50 3098 3196 62452 12200 100.0 1.141 ! Near Maximum ! +00.0 98 62.00 3122 3246 64202 12240 100.0 1.127 ! Near Maximum ! +00.8 99 62.50 3146 3296 66003 12280 100.0 1.113 !DANGEROUS LOAD-DO NOT USE! +01.6 100 63.00 3169 3346 67855 12319 100.0 1.100 !DANGEROUS LOAD-DO NOT USE! +02.4 101 63.50 3193 3396 69760 12358 100.0 1.086 !DANGEROUS LOAD-DO NOT USE! +03.2 102 64.00 3217 3446 71722 12395 100.0 1.073 !DANGEROUS LOAD-DO NOT USE! +04.0 102 64.50 3240 3497 73741 12433 100.0 1.060 !DANGEROUS LOAD-DO NOT USE! Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge Data for burning rate increased by 5% relative to nominal value: +Ba 98 62.00 3187 3383 71171 11987 100.0 1.081 !DANGEROUS LOAD-DO NOT USE! Data for burning rate decreased by 5% relative to nominal value: -Ba 98 62.00 3040 3079 57314 12509 99.8 1.181 ! Near Maximum ! [/code] First try at a group with the 150 ABLR's (62 grains of MRP)...shows promise I think. [URL=http://s217.photobucket.com/user/Ridgerunner665/media/TgtGfx%20150%20ablr_zps9kl69jiv.jpg.html][IMG]http://i217.photobucket.com/albums/cc137/Ridgerunner665/TgtGfx%20150%20ablr_zps9kl69jiv.jpg[/IMG][/URL] Also... 160 Accubond, Norma MRP 58.5 = 2,956 fps 59 = 2,972 fps 59.5 = 2,989 fps 60 = 3,003 fps, no signs of pressure but a dialed in QuickLoad says 60.5 is maxed out at 3,027 fps, so I'm not chasing this one any further. [/QUOTE]
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