QL Request - 358 Norma Magnum w .358 Cal-254g Hammer Hunter

gonfad · Dec 25, 2021

Hello, wanted to see if anyone could run a QL for me for a 358 Norma Mag with a 23.75” barrel and 1:12 twist for a 254gr Hammer Hunter. Have some load data from various manuals and was trying IMR-4350, but it’s really compressed without getting to max loads with the smallest charge range for a 250gr.
Thanks!

JD338 · Dec 26, 2021

The 358 Norma is a real powerhouse. Since it's basically a necked up 338 WM, I would think a faster burn rate like IMR/H4895 and RL19 would get you where you want to be.

JD338

DrMike · Dec 26, 2021

My QL does not include Hammer bullets. If the latest update includes those bullets, I'd be happy to help.

gonfad · Dec 26, 2021

Thanks @DrMike and @JD338. I saw some of the older QL posts for 358 NM for the some 250gr 358 NM loads. I have some IMR-4895, as well as Staball6.5 and Win 760, so I think that gives me enough options to work with for now.

RL338 · Dec 26, 2021

I’m running the June 2021 QL update and it has Hammer bullets in it. I have no idea how they post their results on here. There is another update coming in January 2022.

gonfad · Apr 25, 2022

Hello,
Just wanted to circle back on this with my results from the IMR-4350.
This shoot was only for velocity at 25yards, but grouping overall was about 2.5 MOA. One shot per charge. Did not get to stiff bolt or flattened primers.
Cartridge: 358 Norma Mag
Action: Mauser
Barrel Mfg: Unknown
Barrel length: 24"
Barrel twist: 1:12
Projectile: Hammer Hunter .358" 254gr
O.A.L: TBD
Brass: Mixed HS 300 Win Mag brass necked up to 358 and trimmed
Primer: CCI LRM
Factory Crimp: None
Powder: IMR-4350
***************
GR FPS
68 2651
68.5 2635
69 2602
69.5 2656
70 2668
70.5 2668
71 2700 - Powder in case started to be compressed
71.5 2714
72 2719
72.5 2706
73 2752 - By 73, this was a very compressed load.
73.5 2787
74 2805
74.5 2808
75 2797 - It was tough to get this to fit in the case at the OAL that fit in the mag.

DrMike · Apr 25, 2022

The newest QL data does include Hammer bullets. The data requested provides this projection:

Code:

Cartridge          : .358 Norma Mag.
Bullet             : .358, 245, Hammer SH
Useable Case Capaci: 74.228 grain H2O = 4.820 cm³
Cartridge O.A.L. L6: 3.346 inch = 84.99 mm
Barrel Length      : 23.8 inch = 603.3 mm
Powder             : IMR 4350

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   98    66.60   2491    3375   44030   8131     93.6    1.312
-09.0   99    67.34   2519    3452   45590   8227     94.1    1.292
-08.0  100    68.08   2547    3529   47205   8321     94.6    1.272
-07.0  101    68.82   2575    3608   48881   8412     95.1    1.253
-06.0  102    69.56   2603    3687   50619   8501     95.5    1.234
-05.0  103    70.30   2632    3768   52418   8586     95.9    1.215
-04.0  104    71.04   2660    3849   54293   8669     96.3    1.197  ! Near Maximum !
-03.0  105    71.78   2688    3931   56231   8749     96.7    1.178  ! Near Maximum !
-02.0  107    72.52   2716    4014   58236   8826     97.0    1.161  ! Near Maximum !
-01.0  108    73.26   2744    4097   60314   8900     97.4    1.143  ! Near Maximum !
+00.0  109    74.00   2773    4182   62471   8970     97.7    1.126  ! Near Maximum !
+01.0  110    74.74   2801    4267   64711   9037     98.0    1.109  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    75.48   2829    4353   67037   9101     98.3    1.093  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    76.22   2857    4440   69453   9161     98.5    1.077  !DANGEROUS LOAD-DO NOT USE!
+04.0  113    76.96   2885    4527   71965   9217     98.8    1.061  !DANGEROUS LOAD-DO NOT USE!
+05.0  114    77.70   2913    4616   74577   9270     99.0    1.045  !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    109    74.00   2896    4562   74564   8820    100.0    1.049  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    109    74.00   2607    3697   50924   8695     91.6    1.228

That would be a moderately compressed load, to be sure.