Clean burning powder?

Discussion in 'Reloading Discussions' started by Sublime, Jan 22, 2016.

  1. Sublime

    Sublime
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    So I'm on my last tin of MP200. I'm considering switching to either MS200 or S121, purely for finding a cleaner burning powder than MP200, which leaves a layer of gunk on the internals of the firearm after every shoot. Cases also take longer to clean and easier to lose.

    I would love to hear your opinions and reasoning on which one to use for 9mm Para?

    Proper load development will follow, based on suggestions received.
     
  2. Vega5

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    I use S121 purely because its cheap. MS200 is O think a better powder from a "impulse" POV.
     
  3. DuaneWessels

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    I use MS200, burns clean. Not that much more expensive than S121 plus I load only 3.8gr behind a Frontier 147gr so the tin last quite awhile.
     
  4. Vega5

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    R220 vs R350? Not a huge difference?
     
  5. DuaneWessels

    DuaneWessels
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    Jeez I did not know it's that big...well at least not at my local gun shop.
     
  6. neilh

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    Heard rumours of S121 retailing at the same price as MS last year.

    I'd still take it over MS. More rounds per tin and it dispenses better than MS
     
  7. neilh

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    Have you chronied that load? It seems low, like .4gr or more
     
  8. Tinus de Jager

    Tinus de Jager
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    I use S121 for .45ACP. Works a charm.
     
  9. DuaneWessels

    DuaneWessels
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    Jip, 147gr Frontier RN, 3.8gr MS200, 28mm COL gives me an average of 928f/s and an average pf of 136. Knocks steel over first time (When I can hit them) and groups as well as I can shoot a grouping. I used to load the same with a COL of 29mm and this just made factor but sometimes failed to knock steel over. I wanted to up the load but Craig at Rooikraal suggested I drop the COL. It worked perfectly.

    This is out of my SP2022 with a shortish barrel.
     
  10. 762

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    Just remember, if you switch to a faster powder, the peak pressure will go up, for the same MV.

    This higher pressure does have the advantage of giving a cleaner burn, but also will increase strain on the bullets and the gun. There is no way to escape the law of physics.

    S121 when used in a 9mmP, will generate max allowable pressures at, and sometimes before, minor PF is reached, depending on various variables. While max pressure loads are safe, there is no safety margin should anything go wrong. Factors that could push the pressure over max, could include such common occourances as powder measuring variations, bullet set-back, component dimensional tolerances or a dirty bore.

    My personal aim is to get the lowest possible peak pressure, for a given MV. To acheive this, I use the slowest suitable powder. For a 9mmP this would be S221. It is marginally dirtier, but this has not affected any of my pistols' functioning within 500 rounds.

    The 45 ACP is a different matter, since it operates at much lower pressures. The faster powders (S121, MS200) still keep the peak pressure way below max with sensible (major PF) loads.
     
    CKCSGEOFF likes this.

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