Which Somchem for .375H&H, 20" barrel

Discussion in 'Reloading' started by Boela, Mar 2, 2019.

  1. Boela

    Boela AH Veteran

    Joined:
    May 11, 2015
    Messages:
    220
    Video/Photo:
    24
    Likes Received:
    412
    Location:
    Richards Bay
    Member of:
    Zululand Hunters & Conservation Association, South African Hunters Association, PHASA
    Hunted:
    South Africa, England, Wales, Austria, Swaziland, US: Idaho, Alaska
    I am a complete novice when it comes to reloading and am I hoping that a reloading enthusiast will be willing to help me regarding Somchem powders...... @IvW, @Dewald, @Gert Odendaal....... @anyone else willing to help?

    I need to reload for said calibre and after numerous phone calls across South Africa, I came to the short answer from multiple dealers that S335 is either discontinued or will it not be in stock for the foreseable future...?
    I have no means to verify this, nor the means to double check if this is indeed the case.

    I have a cracking S335 load using 300gr Peregrine VRG3 bullets. I now need to make the decision if I am going to try and source S335 from some mysterious source, or am I going to switch to a more readily available powder i.e. S341 or S355 ?
    S341 being granule / spherical powder and S355 extruded (both combusting at medium speed)

    I hereby ask if some well informed individual would mind explaining the pro's and con's vs the different powders? What would you recommend me to use - S341 or S355?
     
    Last edited: Mar 2, 2019

  2. bruce moulds

    bruce moulds AH Elite

    Joined:
    Aug 10, 2018
    Messages:
    1,071
    Likes Received:
    908
    boela,
    355 and 341 look to be a bit slower burning than 335
    341 looks to be a tiny bit slower than355, which looks about the same burning rate as varget.
    there seems to be one slower again, 365 which looks to be burning rate similar to h4350.
    h4350 has given good velocities in 375 with 270 to 300 gn bullets.
    it might depend on the density of the powder how much you can get in the case.
    bruce.
     
    Boela likes this.

  3. Boela

    Boela AH Veteran

    Joined:
    May 11, 2015
    Messages:
    220
    Video/Photo:
    24
    Likes Received:
    412
    Location:
    Richards Bay
    Member of:
    Zululand Hunters & Conservation Association, South African Hunters Association, PHASA
    Hunted:
    South Africa, England, Wales, Austria, Swaziland, US: Idaho, Alaska
    Thank you for the feedback Bruce,
    I would be reluctant to use the S365 in order to avoid potential compressed loads- a quick look in the manual also did not show any recommendations for it.

    If we had to cut the burn rate out of the equation, what is the reason for the difference between the "shapes" of the powders? (Granule vs Extruded) Surely there should be a reason for it? Or am I now simply concerned about nothing?

    We do have Vihtavuori powder available, but it is quite expensive and not that readily available. Any views on that?
     

  4. IvW

    IvW AH Legend

    Joined:
    Dec 20, 2016
    Messages:
    2,019
    Video/Photo:
    57
    Likes Received:
    3,298
    Location:
    South Africa
    Member of:
    BASA, CHASA
    Hunted:
    South Africa, Zimbabwe, Mozambique, Botswana, Namibia,Zambia
    S341 or S335 or even S355. Short barrel would like the faster burning powder.
     
    Ridgewalker likes this.

  5. IvW

    IvW AH Legend

    Joined:
    Dec 20, 2016
    Messages:
    2,019
    Video/Photo:
    57
    Likes Received:
    3,298
    Location:
    South Africa
    Member of:
    BASA, CHASA
    Hunted:
    South Africa, Zimbabwe, Mozambique, Botswana, Namibia,Zambia
    S355 had a few bad burn efficiency batches.
     

  6. Boela

    Boela AH Veteran

    Joined:
    May 11, 2015
    Messages:
    220
    Video/Photo:
    24
    Likes Received:
    412
    Location:
    Richards Bay
    Member of:
    Zululand Hunters & Conservation Association, South African Hunters Association, PHASA
    Hunted:
    South Africa, England, Wales, Austria, Swaziland, US: Idaho, Alaska
    Thank you IvW, looks like the next step will be to start with load development from scratch since no real pro' or con's were highlighted regarding the physical differences.
    I appreciate everyone's input!
     

  7. Dewald

    Dewald AH Veteran

    Joined:
    Aug 16, 2012
    Messages:
    220
    Video/Photo:
    47
    Likes Received:
    289
    Location:
    Empangeni, Zululand
    Member of:
    KZN Hunters/ SAHGCA/
    Hunted:
    South Africa, Namibia
    S341. Your local shop has. Otherwise IMR4895. Safari has.

    I’ll call you tomorrow. Work up to the same velocity over the chrony and fine tune further.
     
    Boela likes this.

  8. Alchemist

    Alchemist AH Senior Member

    Joined:
    Nov 19, 2014
    Messages:
    78
    Video/Photo:
    12
    Likes Received:
    126
    Location:
    Pretoria
    Member of:
    NSA , SA Wingshooters
    S355 will produce a less than 100 % powder burn as it is to slow for the 20” barrel. I have a 26” barrel and even this produce a less than 100 % burn. Problem is that this gives inconsistand groupings.
    I would tend to agree with Dewald and try S341 if S335 is a problem.
     
    Shootist43 and Boela like this.

  9. Boela

    Boela AH Veteran

    Joined:
    May 11, 2015
    Messages:
    220
    Video/Photo:
    24
    Likes Received:
    412
    Location:
    Richards Bay
    Member of:
    Zululand Hunters & Conservation Association, South African Hunters Association, PHASA
    Hunted:
    South Africa, England, Wales, Austria, Swaziland, US: Idaho, Alaska
    Thank you Alchemist, Dewald and I had a discussion over the phone and it was decided to go with S341 - just as you are suggesting.
    Thank you for your input, it is appreciated.
     

  10. IvW

    IvW AH Legend

    Joined:
    Dec 20, 2016
    Messages:
    2,019
    Video/Photo:
    57
    Likes Received:
    3,298
    Location:
    South Africa
    Member of:
    BASA, CHASA
    Hunted:
    South Africa, Zimbabwe, Mozambique, Botswana, Namibia,Zambia
    What load did you end up with?
     
    Ridgewalker likes this.

Share This Page

 
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice