Cartridge : .458 Win.Mag.
Bullet : .458, 400, Speer FN 2479
Cartridge O.A.L. L6: 3.000 inch or 76.20 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Alliant UNIQUE
Predicted data by increasing and decreasing the given charge,
incremented in steps of 3.333% 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
-33.3 51 20.00 1436 1831 28001 1681 100.0 1.901
-30.0 53 21.00 1474 1931 30215 1756 100.0 1.840
-26.7 56 22.00 1512 2031 32492 1831 100.0 1.785
-23.3 59 23.00 1549 2131 34834 1906 100.0 1.734
-20.0 61 24.00 1585 2231 37241 1981 100.0 1.687
-16.7 64 25.00 1620 2332 39714 2055 100.0 1.639
-13.3 66 26.00 1655 2433 42254 2128 100.0 1.595
-10.0 69 27.00 1689 2534 44862 2202 100.0 1.553
-06.7 71 28.00 1723 2635 47540 2274 100.0 1.515
-03.3 74 29.00 1755 2737 50288 2347 100.0 1.479
+00.0 76 30.00 1788 2839 53109 2419 100.0 1.445
+03.3 79 31.00 1820 2941 56004 2490 100.0 1.413
+06.7 82 32.00 1851 3044 58974 2561 100.0 1.383
+10.0 84 33.00 1882 3146 62022 2631 100.0 1.355
+13.3 87 34.00 1913 3250 65149 2701 100.0 1.327
+16.7 89 35.00 1943 3353 68358 2771 100.0 1.302