LOAD DATA HELP: Sierra MatchKing Boat Tail Hollow Point 30 Cal 168 Grain #2200

[Parashooter]

Perhaps counter-intuitively, we actually see a higher proportion of powder burn as the charge, pressure, and temperature increase. Put simply, with lighter loads of slow powder, it never gets hot enough to burn well.

QuickLOAD output gives an idea of the dynamic involved. (Focus on "Burnt %" column)

Cartridge : .308 Win.
Bullet : .308, 168, Hornady BTHP Natl M 30501
Cartridge O.A.L. L6: 2.800 inch or 71.12 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : IMR 4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.381% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Chg Vel. Enrgy Pmax Pmuz Burnt B_Time
% --- % - Grns fps ft.lbs psi - psi - % -- ms

-23.8 75 32.00 1697 1075 17455 4541 65.9 1.832
-21.4 77 33.00 1748 1140 18650 4777 67.5 1.781
-19.0 80 34.00 1800 1208 19931 5016 69.1 1.731
-16.7 82 35.00 1852 1279 21302 5257 70.7 1.683
-14.3 85 36.00 1905 1354 22770 5500 72.3 1.636
-11.9 87 37.00 1959 1431 24334 5744 73.8 1.591
-09.5 89 38.00 2013 1511 26032 5989 75.4 1.546
-07.1 92 39.00 2068 1595 27845 6234 76.9 1.503
-04.8 94 40.00 2123 1681 29789 6478 78.4 1.461
-02.4 96 41.00 2179 1771 31880 6721 79.9 1.419
+00.0 99 42.00 2236 1864 34128 6962 81.3 1.379
+02.4 101 43.00 2293 1961 36548 7199 82.8 1.340

Information

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[usabaker]

QuickLOAD output gives an idea of the dynamic involved. (Focus on "Burnt %" column)

This is awesome data! You are right "counter-intuitively" until seeing this data I never really looked at it from this aspect. Interesting indeed. I have never heard of QuickLOAD; just looked it up I guess if I were a percision shooter this software would be invaluable But $155.00 is a lot of game meat.

Thank you for the information and a new way of looking at loads.