Cartridge : .220 Swift
Bullet : .224, 55, Speer SP 1047
Useable Case Capaci: 44.761 grain H2O = 2.906 cm³
Cartridge O.A.L. L6: 2.680 inch = 68.07 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Accurate 2700
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 89 38.52 3419 1427 43873 9143 90.0 1.132
-09.0 90 38.95 3458 1460 45363 9261 90.6 1.114
-08.0 91 39.38 3497 1493 46905 9376 91.2 1.097
-07.0 92 39.80 3536 1527 48502 9489 91.7 1.080
-06.0 93 40.23 3575 1561 50155 9600 92.3 1.063
-05.0 94 40.66 3614 1595 51868 9708 92.8 1.047
-04.0 95 41.09 3654 1630 53642 9814 93.3 1.031 ! Near Maximum !
-03.0 96 41.52 3693 1666 55481 9916 93.8 1.015 ! Near Maximum !
-02.0 97 41.94 3732 1701 57387 10016 94.3 1.000 ! Near Maximum !
-01.0 98 42.37 3772 1737 59364 10113 94.7 0.985 ! Near Maximum !
+00.0 99 42.80 3811 1774 61414 10206 95.2 0.970 ! Near Maximum !
+01.0 100 43.23 3850 1811 63541 10297 95.6 0.955 !DANGEROUS LOAD-DO NOT USE!
+02.0 101 43.66 3890 1848 65748 10383 96.0 0.941 !DANGEROUS LOAD-DO NOT USE!
+03.0 102 44.08 3929 1886 68040 10466 96.4 0.926 !DANGEROUS LOAD-DO NOT USE!
+04.0 103 44.51 3969 1924 70421 10546 96.8 0.912 !DANGEROUS LOAD-DO NOT USE!
+05.0 104 44.94 4008 1962 72895 10622 97.2 0.899 !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 99 42.80 3910 1867 66706 10311 97.5 0.934 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 99 42.80 3700 1672 56190 10000 92.1 1.011 ! Near Maximum !
