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Drams to FPS

Discussion in 'Uncategorized Threads' started by mixer, Aug 6, 2008.

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  1. mixer

    mixer Well-Known Member

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    There's more to it than that. Such as shot weight, guage, etc but assuming you're asking about a 12 ga 1-1/8 load your 1090fps seems about right.


    Eric
     
  2. Hauser

    Hauser Member

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    Copied this from the Remington web site. Hope it helps.



    STS12LR 12 PremierĀ® STSĀ®


    Low Recoil 2 3/4"


    2 1/2 Dram 1100fps 1 1/8 oz


    Jerry Hauser
     
  3. phirel

    phirel TS Member

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    Fred- According to industry standards (SAMMI) a 3 dram load can be anything between 1110 and 1290 Ft/sec. Conversion of dram equivalent to Ft/sec can get very confusing. Printing 2 3/4 dram equivalent and 3 dram equivalent on different boxes containing the same shells is not a violation of industry standards and I have found one shell manufacturer in Spain that did, and possibly still does, that.

    Pat Ireland
     
  4. Michael Jobe

    Michael Jobe TS Member

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    Fred, if you've got a Lyman manual, it has a page where it lists all the different gauges and shot charges, and what velocity the various dram eq. would be for those loads.

    If you're wanting to load really light loads, you may want to try that new Winchester AALite powder (I know, I know, you like Alliant powders, I do too). I picked up a pound last week and have tried two of the 1 1/8 oz loads, one around 1000 fps, the other around 1040 fps. They break targets just fine, and really don't seem any slower than 1150 fps loads at the 16 yard line. I was shooting them out of a new O/U I bought Monday (which is way light and kicks like a sumbitch), and they were certainly softer shooting than 2 3/4 dram Gun Clubs out of that gun.

    ~Michael
     
  5. mkstephen

    mkstephen Active Member

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    You stated:

    ...I know 3drams is about 1200 feet per second I am thinking this 2 1/2 drams is about 1090 feet per second, please advise...

    The rule of thumb for 12 gauge is;

    Each 1/4 dram = 50 fps - more is plus - less is minus

    Each 1/8 oz of shot = 50 fps - more is less - less is plus

    Given that a 3 dram load with 1 1/8 oz shot = 1200 fps - then

    2 1/2 drams = (2) 1/4 drams reduction from the given load above so...

    1200 fps minus 100 = 1100 fps. While this is not exact it is appoximate.

    Example using 3 dram 1 1/8 oz as the starting load;

    "How fast is a 4 dram load with 1 1/2 shot?"

    4 drams = (4) 1/4 oz units increase = +200 fps

    1 1/2 oz shot = (3) 1/8 oz units in reduction = -150 fps

    So the answer is 1200 + 200 - 150 = 1250 fps.

    More powder increases - more shot reduces.

    Less powder decreases - less shot increases.

    Michael Stephenson
     
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