358 Norma Magnum

[Johnn Peterson]

I have a pair of rifles, chambered in 358 Norma Magnum. Recently I acquired two boxes of 310gr Woodleigh Weldcore RN SN bullets. Anyone have any load data they'd like to share??

 

[Potashminer]

Your rifles might be unusual? Had read repeatedly that the very slow twist rate in 358's tended to peter out about 250 grain bullet length? Woodleigh Weldcore are very good bullets, I think, but need to be stabilized like any other bullet - are you okay with those bullet length to your barrel's twist rate??

 

[todbartell]

If the twist rate is 1:14 or faster it should do ok.

Cartridge          : .358 Norma Mag.
Bullet             : .358, 310, Woodleigh SN WeldCore 54
Useable Case Capaci: 74.644 grain H2O = 4.847 cm³
Cartridge O.A.L. L6: 3.346 inch = 84.99 mm
Barrel Length      : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 55839 psi, or 385 MPa
or a maximum loading ratio or filling of 104 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

137 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Alliant Reloder-26                 100.2     74.1     4.80    2523   100.0    55840    9558   1.307  ! Near Maximum !
Vihtavuori N560                    102.3     71.9     4.66    2469    96.6    55840    9703   1.298  ! Near Maximum !
Alliant Reloder-22                 102.5     71.3     4.62    2455    98.3    55840    9392   1.304  ! Near Maximum !
IMR 7828 SSC                       100.9     71.3     4.62    2452    96.9    55840    9370   1.293  ! Near Maximum !
Alliant Reloder-17                  89.7     64.8     4.20    2440   100.0    55840    8363   1.308  ! Near Maximum !
Ramshot Magnum                     102.8     77.0     4.99    2440    98.7    55840    9060   1.312  ! Near Maximum !
Alliant Reloder-23                 104.0     70.0     4.54    2425   100.0    54065    8485   1.322
Alliant Reloder-16                  95.7     64.1     4.16    2413   100.0    55840    8231   1.323  ! Near Maximum !
Alliant Reloder-19                  98.8     68.0     4.40    2409    98.1    55840    8881   1.315  ! Near Maximum !
Ramshot Hunter                      94.2     66.9     4.34    2408    99.7    55840    8635   1.321  ! Near Maximum !
Hodgdon H414                        88.8     64.6     4.19    2397    99.3    55840    8600   1.327  ! Near Maximum !
Winchester 760                      88.8     64.6     4.19    2397    99.3    55840    8600   1.327  ! Near Maximum !
Vihtavuori N550                     90.7     63.8     4.13    2387   100.0    55840    8343   1.337  ! Near Maximum !
Hodgdon H4831 SC                   100.2     69.7     4.52    2383    96.1    55840    8720   1.314  ! Near Maximum !
IMR 4831                            98.1     64.6     4.19    2372   100.0    55840    8049   1.340  ! Near Maximum !
Hodgdon Hybrid 100V                 96.1     64.0     4.15    2358   100.0    55840    7553   1.333  ! Near Maximum !
Hodgdon H4350                       95.8     64.5     4.18    2348    98.8    55840    8138   1.334  ! Near Maximum !
IMR 4350                            94.1     64.4     4.17    2347    98.8    55840    8122   1.334  ! Near Maximum !

 

[Johnn Peterson]

Your rifles might be unusual? Had read repeatedly that the very slow twist rate in 358's tended to peter out about 250 grain bullet length? Woodleigh Weldcore are very good bullets, I think, but need to be stabilized like any other bullet - are you okay with those bullet length to your barrel's twist rate??

To be truthful, not really sure. I'm pretty well set up for use of 200gr, 225gr and 250gr applications. Just thought I'd give these 310gr Woodleighs a try, if I can find some appropriate load data. Any suggestions? Down the road, I may have to see if I can pick up one of their manuals as I also have some of their 215gr bullets for the 303 British calibre.

 

[Potashminer]

Have not loaded for 358 Norma Mag. So would have to rely on Quickload, etc. as above. I am interested in what I read about twist rate though. I see folks discussing topic as if it about weight, but everything that I read says it is about length. Had shown previously that 7mm Hornady 175 grain is shorter than a 150 grain Partition. Here is a Hornady 174 grain flat base .312" bullet compared to a Woodleigh 174 grain flat base .312" bullet. The Woodleigh is .100" longer - 1.106" versus 1.007". I am still trying to understand if that difference in length is significant or not.

 

[Johnn Peterson]

If the twist rate is 1:14 or faster it should do ok.

Cartridge          : .358 Norma Mag.
Bullet             : .358, 310, Woodleigh SN WeldCore 54
Useable Case Capaci: 74.644 grain H2O = 4.847 cm³
Cartridge O.A.L. L6: 3.346 inch = 84.99 mm
Barrel Length      : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 55839 psi, or 385 MPa
or a maximum loading ratio or filling of 104 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

137 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Alliant Reloder-26                 100.2     74.1     4.80    2523   100.0    55840    9558   1.307  ! Near Maximum !
Vihtavuori N560                    102.3     71.9     4.66    2469    96.6    55840    9703   1.298  ! Near Maximum !
Alliant Reloder-22                 102.5     71.3     4.62    2455    98.3    55840    9392   1.304  ! Near Maximum !
IMR 7828 SSC                       100.9     71.3     4.62    2452    96.9    55840    9370   1.293  ! Near Maximum !
Alliant Reloder-17                  89.7     64.8     4.20    2440   100.0    55840    8363   1.308  ! Near Maximum !
Ramshot Magnum                     102.8     77.0     4.99    2440    98.7    55840    9060   1.312  ! Near Maximum !
Alliant Reloder-23                 104.0     70.0     4.54    2425   100.0    54065    8485   1.322
Alliant Reloder-16                  95.7     64.1     4.16    2413   100.0    55840    8231   1.323  ! Near Maximum !
Alliant Reloder-19                  98.8     68.0     4.40    2409    98.1    55840    8881   1.315  ! Near Maximum !
Ramshot Hunter                      94.2     66.9     4.34    2408    99.7    55840    8635   1.321  ! Near Maximum !
Hodgdon H414                        88.8     64.6     4.19    2397    99.3    55840    8600   1.327  ! Near Maximum !
Winchester 760                      88.8     64.6     4.19    2397    99.3    55840    8600   1.327  ! Near Maximum !
Vihtavuori N550                     90.7     63.8     4.13    2387   100.0    55840    8343   1.337  ! Near Maximum !
Hodgdon H4831 SC                   100.2     69.7     4.52    2383    96.1    55840    8720   1.314  ! Near Maximum !
IMR 4831                            98.1     64.6     4.19    2372   100.0    55840    8049   1.340  ! Near Maximum !
Hodgdon Hybrid 100V                 96.1     64.0     4.15    2358   100.0    55840    7553   1.333  ! Near Maximum !
Hodgdon H4350                       95.8     64.5     4.18    2348    98.8    55840    8138   1.334  ! Near Maximum !
IMR 4350                            94.1     64.4     4.17    2347    98.8    55840    8122   1.334  ! Near Maximum !

Thanks guy. Appreciate the input. There's a trip to see my buddy in Terrace once this COVID-19 situation calms down a little. I'll see if I can stop in at the store for a chat and component purchase on my way through. Thanks again. Best of the season to you & yours. Good shooting, stay safe and healthy.

 

[Johnn Peterson]

Have not loaded for 358 Norma Mag. So would have to rely on Quickload, etc. as above. I am interested in what I read about twist rate though. I see folks discussing topic as if it about weight, but everything that I read says it is about length. Had shown previously that 7mm Hornady 175 grain is shorter than a 150 grain Partition. Here is a Hornady 174 grain flat base .312" bullet compared to a Woodleigh 174 grain flat base .312" bullet. The Woodleigh is .100" longer - 1.106" versus 1.007". I am still trying to understand if that difference in length is significant or not.

View attachment 444886

Not an issue for me with the 303Br. or most other calibres. In this 358NM question, and going with a not commonly known bullet weight, my primary or initial 'question' is to do with the powder charge.