Real .243 Win Velocities
- Thread starter beerbucksducks
- Start date
- Thread starter
- #22
beerbucksducks
Beginner
- Dec 1, 2014
- 139
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Not since I developed the original load, which looking at my ammo box this morning, turned out to be 40.5 gr not 41. Seating depth will be next pending my next range session.
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Sent from my iPhone using Tapatalk
Looks like as long as you keep speeds under 3000 with H4350 you are below 60kpsi. Keep in mind that Optimum barrel time for 22" barrel in this speed range with H4350 is 1.12 ms or in this instance 2934fps which will give approx 56kpsi. Let magnetospeed guide you.
Cartridge : .243 Win.
Bullet : .243, 95, Nosler BalTip 24095
Useable Case Capaci: 48.826 grain H2O = 3.170 cm³
Cartridge O.A.L. L6: 2.710 inch = 68.83 mm
Barrel Length : 22.0 inch = 558.8 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 88 38.79 2709 1548 43629 10385 95.0 1.254
-09.0 89 39.22 2737 1580 44985 10503 95.5 1.236
-08.0 90 39.65 2765 1613 46381 10618 95.9 1.218
-07.0 91 40.08 2794 1646 47819 10729 96.3 1.201
-06.0 92 40.51 2822 1680 49300 10838 96.7 1.184
-05.0 93 40.95 2850 1714 50825 10942 97.1 1.168
-04.0 94 41.38 2878 1748 52396 11044 97.4 1.152 ! Near Maximum !
-03.0 95 41.81 2906 1782 54014 11141 97.7 1.136 ! Near Maximum !
-02.0 96 42.24 2934 1816 55682 11235 98.0 1.120 ! Near Maximum !
-01.0 97 42.67 2962 1851 57401 11325 98.3 1.105 ! Near Maximum !
+00.0 98 43.10 2990 1886 59171 11411 98.6 1.090 ! Near Maximum !
+01.0 99 43.53 3018 1921 60996 11493 98.8 1.075 !DANGEROUS LOAD-DO NOT USE!
+02.0 100 43.96 3046 1957 62877 11571 99.0 1.060 !DANGEROUS LOAD-DO NOT USE!
+03.0 101 44.39 3073 1993 64816 11645 99.2 1.046 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 44.82 3101 2028 66816 11714 99.4 1.032 !DANGEROUS LOAD-DO NOT USE!
+05.0 103 45.26 3128 2064 68878 11779 99.6 1.018 !DANGEROUS LOAD-DO NOT USE!
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 98 43.10 3115 2047 69193 11197 100.0 1.016 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 43.10 2822 1680 49297 11103 93.3 1.185
Cartridge : .243 Win.
Bullet : .243, 95, Nosler BalTip 24095
Useable Case Capaci: 48.826 grain H2O = 3.170 cm³
Cartridge O.A.L. L6: 2.710 inch = 68.83 mm
Barrel Length : 22.0 inch = 558.8 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 88 38.79 2709 1548 43629 10385 95.0 1.254
-09.0 89 39.22 2737 1580 44985 10503 95.5 1.236
-08.0 90 39.65 2765 1613 46381 10618 95.9 1.218
-07.0 91 40.08 2794 1646 47819 10729 96.3 1.201
-06.0 92 40.51 2822 1680 49300 10838 96.7 1.184
-05.0 93 40.95 2850 1714 50825 10942 97.1 1.168
-04.0 94 41.38 2878 1748 52396 11044 97.4 1.152 ! Near Maximum !
-03.0 95 41.81 2906 1782 54014 11141 97.7 1.136 ! Near Maximum !
-02.0 96 42.24 2934 1816 55682 11235 98.0 1.120 ! Near Maximum !
-01.0 97 42.67 2962 1851 57401 11325 98.3 1.105 ! Near Maximum !
+00.0 98 43.10 2990 1886 59171 11411 98.6 1.090 ! Near Maximum !
+01.0 99 43.53 3018 1921 60996 11493 98.8 1.075 !DANGEROUS LOAD-DO NOT USE!
+02.0 100 43.96 3046 1957 62877 11571 99.0 1.060 !DANGEROUS LOAD-DO NOT USE!
+03.0 101 44.39 3073 1993 64816 11645 99.2 1.046 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 44.82 3101 2028 66816 11714 99.4 1.032 !DANGEROUS LOAD-DO NOT USE!
+05.0 103 45.26 3128 2064 68878 11779 99.6 1.018 !DANGEROUS LOAD-DO NOT USE!
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 98 43.10 3115 2047 69193 11197 100.0 1.016 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 43.10 2822 1680 49297 11103 93.3 1.185
“Optimum barrel time”?
No two barrels are anything alike either. Interior finish, throating, lead angle, chamber dimensions, crown (yes, they effect pressure/velocity too), etc. all vary far too much to assume:
A: that the optimum barrel time is “X”. That’s borderline preposterous.
B: that just because you’re “under 3000 fps” your pressure is fine. Though, this is a much better presumption than the first.
Let the rifle/brass/chronograph/targets tell you when you’re where you wanna be.
PS.... 2850 fps was the “best” in your first assertion.... now 2934 fps is best?
Are you an engineer?
No two barrels are anything alike either. Interior finish, throating, lead angle, chamber dimensions, crown (yes, they effect pressure/velocity too), etc. all vary far too much to assume:
A: that the optimum barrel time is “X”. That’s borderline preposterous.
B: that just because you’re “under 3000 fps” your pressure is fine. Though, this is a much better presumption than the first.
Let the rifle/brass/chronograph/targets tell you when you’re where you wanna be.
PS.... 2850 fps was the “best” in your first assertion.... now 2934 fps is best?
Are you an engineer?
