Crater bullet data for .450 and 45-70
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Thread: Crater bullet data for .450 and 45-70



  1. #1
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    Crater bullet data for .450 and 45-70

    Here is the link to his website.
    http://www.competitor-pistol.com/jb%20home.html

    I will post some real pressure tested data for the .450 using his bullets. I will come back in a little while and copy and paste it. Jae Bok will be putting the data up on his site but I looked a while ago and didn't see it yet. reflex264

    .450 Marlin 550gr Crater

    H322 powder 38.0grs

    210m primer

    Hornady brass

    av vel- 1517fps

    std dev - 5fps

    es- 15fps

    av corrected pressure 43,000psi (.450 Marlin max av is 43,500psi)

    cor fac +4800 included





    .450 Marlin 420gr Crater Lite

    H322 powder 48.7grs

    210m primer

    Hornady brass

    av vel- 1902 fps (test barrel)

    std dev - 7fps

    es- 17fps

    av corrected pressure 43,100psi

    velocity from . 450 Guide Gun 1765fps

    Accuracy from Guide Gun 3 shots under an inch, 10 shots 2"
    Correction factor +4800 included

    --------------------------------------------------------------------------------------

    Ruger #1 and #3
    Ruger #1 45-70 loads. Note the bullets are crimped in the crimp groove on the 550gr Crater 2 for a OAL of 2.781". The Crater Lite 2 because of the thickness of the driving band had to be crimped with the edge of the driving band right at the crimp to chamber in the Ruger.

    45-70 Ruger #1 loads

    550 Crater-2

    H322 powder 42.2grs

    210m primer

    Rem np brass

    av vel- 1632fps

    std dev - 10fps

    es- 27fps

    av corrected pressure 36,600 cup (Ruger No. 1 capable of 50,000cup)

    correction factor + 400cup



    45-70 Ruger #1 loads

    420gr Crater Lite-2

    H322 powder 51.0grs

    210m primer

    Rem np brass

    av vel- 2013fps

    std dev - 14fps

    es- 29fps

    av corrected pressure 48,800 cup

    correction factor + 400cup

    Please do not ask for the data that yielded 5100ftlbs ME. That is a closed chapter. If you want 5100ftlbs buy a .458 or a .416.

    --------------------------------------------------------------------------------------

    Marlin 45-70
    These are the loads that were worked up using case head expansion comparison. These loads are safe in my guns and show expansion on par with loads known to produce 38,000cup and under. Because of the ogive measuring more than .450" over .100" out from the case mouth it was impossible to produce a true test sheet in a saami test barrel. Please reduce charge 10 % and work up.

    Starline brass nickel

    210M primer

    420 Crater Lite

    H322 46.0grs

    velocity 1740fps from 18.5" barrel



    Starline brass nickel

    210M primer

    550 Crater

    H322 37.5grs

    velocity 1500fps from 18.5" barrel

    Working BC for Craters

    Working BC simply means an actual BC measurement taken and calculated from actual shots. BC is not a constant number. The difference between advertised BC and real BC is usualy minute and within normal ranges not even a factor in a levergun bigbore but as you start stretching the range BC is a useful tool to determine the base sight in for your rifle. Using the folowing BC for the craters will get you very close for shooting past 300 yards. It is at around 300 yard that it actualy becomes a factor. As a note of interest since BC increases with a decrease in velocity you would expect the sometimes inflated numbers given out by bullets companies to always be lower than advertised BC. One of the most interesting exceptions I have found involves the 120gr nosler ballistic tip in .264. The advertised BC is generated with a velocity of around 2800fps. I shoot them as fast as 3400fps from my .264. Since the advertised BC is .458 you would expect a drop below .400 in actual BC but in reality the calculated BC is right around .500! GO figure. This example is just to show that these numbers are not set in stone. Happy hunting.

    420gr crater lite BC @ 1740fps = .214

    550gr crater BC @ 1500fps = .230


    Deja vu likes this.


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  2. #2
    Site Contributor Contributing Member
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    btt-


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