Marlin Firearms Forum banner
1 - 4 of 4 Posts

·
Registered
Joined
·
89 Posts
Discussion Starter · #1 ·
Has anyone loaded up the Nosler 168gr Ballistic Tips with IMR-4320? That's pretty much the only powder I can get my hands on that is suitable for 308 locally.

The best I can find is data for the 168gr Sierra HTBP calling for a max of 46gr of powder. I loaded up a few and that's danger close to being a compressed load and I've never done that before.

Could anyone with more experience please tell me if I'm about to blow up my gun?
 

·
Registered
Joined
·
3,110 Posts
46grs of 4320 will be a compressed load according to the Speer Manual #14. Not a concern for most people. 46grs is a max recommended load for Speer 165 according to thier manual. Would recommend dropping back several grains and work up, looking for accuracy and pressure signs. Personnaly, never used this powder, but the 165BT is a superior deer killing bullet in my opinion.
 

·
Registered
Joined
·
903 Posts
I haven't used the Nosler bullets but the best group I ever shot was with the Sierra 168 MatchKing, 43.5-4320 seated 1/16" off the lands.
 

·
Registered
Joined
·
1,188 Posts
Has anyone loaded up the Nosler 168gr Ballistic Tips with IMR-4320? That's pretty much the only powder I can get my hands on that is suitable for 308 locally.

The best I can find is data for the 168gr Sierra HTBP calling for a max of 46gr of powder. I loaded up a few and that's danger close to being a compressed load and I've never done that before.

Could anyone with more experience please tell me if I'm about to blow up my gun?
Here is what QL looks like. This is held to 62,000PSI for the 308, but it looks like 46 grains would be the upper end with some work up. The speed your getting would be the best indicator of PSI's though.

Cartridge : .308 Win. (SAAMI)
Bullet : .308, 168, Nosler BalTip 30168
Useable Case Capaci: 46.494 grain H2O = 3.019 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR 4320


Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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


-20.0 85 36.00 2189 1788 31955 6489 90.6 1.416
-18.0 88 36.90 2242 1876 34098 6687 91.8 1.377
-16.0 90 37.80 2295 1965 36387 6879 92.9 1.338
-14.0 92 38.70 2349 2058 38833 7063 93.9 1.300
-12.0 94 39.60 2402 2152 41450 7239 94.9 1.261
-10.0 96 40.50 2455 2248 44252 7407 95.7 1.224
-08.0 98 41.40 2508 2347 47253 7565 96.5 1.189
-06.0 100 42.30 2561 2447 50474 7713 97.2 1.154
-04.0 102 43.20 2614 2550 53931 7850 97.9 1.121 ! Near Maximum !
-02.0 105 44.10 2667 2654 57650 7975 98.4 1.089 ! Near Maximum !
+00.0 107 45.00 2720 2760 61653 8088 98.9 1.058 !DANGEROUS LOAD-DO NOT USE!
+02.0 109 45.90 2773 2869 65968 8188 99.3 1.028 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 46.80 2826 2978 70628 8275 99.6 0.999 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 47.70 2878 3090 75671 8347 99.8 0.971 !DANGEROUS LOAD-DO NOT USE!
+08.0 115 48.60 2930 3203 81133 8404 99.9 0.944 !DANGEROUS LOAD-DO NOT USE!
+10.0 117 49.50 2982 3318 87069 8446 100.0 0.918 !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 107 45.00 2832 2991 73518 7822 100.0 0.988 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 107 45.00 2565 2454 50902 7952 93.7 1.149
 
1 - 4 of 4 Posts
Top