Home Forums Reloading Big Game Rifles Loading for the 358 NM

I use 4350 for 225 & 250 and 4895 for the 280 Swifts! Velocity comes easy as does recoil!

Looks like it should work really well Gunner. Great case fill and FPS looks pretty good as well.

Cartridge : .358 Norma Mag.
Bullet : .358, 250, Nosler PART SP 44801
Useable Case Capaci: 76.737 grain H2O = 4.982 cm�
Cartridge O.A.L. L6: 3.346 inch = 84.99 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Norma 204

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 84 61.60 2216 2727 31503 7396 86.2 1.544
-18.0 86 63.14 2273 2869 33708 7649 87.6 1.501
-16.0 89 64.68 2331 3016 36078 7896 88.9 1.458
-14.0 91 66.22 2389 3168 38624 8137 90.1 1.414
-12.0 93 67.76 2447 3324 41366 8370 91.3 1.370
-10.0 95 69.30 2505 3484 44318 8594 92.5 1.326
-08.0 97 70.84 2564 3649 47501 8809 93.5 1.285
-06.0 99 72.38 2623 3819 50938 9012 94.5 1.245
-04.0 101 73.92 2682 3993 54658 9205 95.4 1.206 ! Near Maximum !
-02.0 103 75.46 2741 4171 58686 9384 96.3 1.169 ! Near Maximum !
+00.0 105 77.00 2801 4354 63059 9550 97.0 1.133 ! Near Maximum !
+02.0 108 78.54 2860 4541 67810 9701 97.7 1.098 !DANGEROUS LOAD-DO NOT USE!
+04.0 110 80.08 2920 4733 72987 9836 98.3 1.064 !DANGEROUS LOAD-DO NOT USE!
+06.0 112 81.62 2980 4929 78640 9955 98.8 1.031 !DANGEROUS LOAD-DO NOT USE!
+08.0 114 83.16 3040 5129 84828 10055 99.2 1.000 !DANGEROUS LOAD-DO NOT USE!
+10.0 116 84.70 3100 5334 91613 10136 99.6 0.969 !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 105 77.00 2936 4786 75866 9459 99.9 1.052 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 77.00 2622 3816 51483 9165 90.2 1.238


That 358 Norma is a cool cat!

That's great news 458!!!!! Thanks.

Looks about right Beretz, my rifle sports a 25.5" barrel, that may be where the 2800 fps comes from with a charge of only 75 gr of N-204.

Did I happen to mention how much fun it was firing a 25" barreled 358 NM mountain pistol through the chrono? .....................

No thanks!

Your 25.5" barrel should work very well. Sounds like a beautiful gun.. Well, I haven't met any .358 caliber rifles I didn't like at least a little bit.

LOL, that mutha was a buckin sombitch, bought this rifle from JCMCubic here at the fire, she's gonna be a really nice looker when finished.

Was built by a smith named Longfellow.