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Thread: Gordon's reloading tool

  1. #1
    Boolit Master ACC's Avatar
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    Gordon's reloading tool

    I have been playing with Gordon's reloading tool. But it seems to me that I can input a load and it never even comes close to matching any of my reloading manuals. In fact I can input a load that is over MAX and it doesn't show that it is an over pressure load. Am I doing something wrong here? It's a great piece of software. Here is a screen capture of what I see. Any help here?
    Attached Thumbnails Attached Thumbnails 2022-05-19 16 16 23a.jpg  

  2. #2
    Boolit Buddy
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    Greetings,

    I, too, have been experimenting with Gordon's Loading Tool. There are so many parameters that can affect the end result.

    If you go to the GRTools.de website, there is an opportunity to join the Discord forum. Here you can ask questions and get answers from the remaining team.

    I compare my results with my friends QuickLoad data and we concur quite often.

    Not perfect as yet, but a great piece of software for the price.

    Cheers,

    Dave

  3. #3
    Boolit Grand Master


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    If it is anything like Quickloads, they can't accurately calculate anything except bottleneck high pressure cartridges. Such programs are kind of fun for comparing some changes, especially barrel length, but are ultimately worthless at predicting safe loads, especially in handgun rounds.

  4. #4
    Boolit Buddy
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    SAAMI MAX is 17000psi. CIP MAX is 21755.66. Which is what GRT is using.

    Sent from my SM-N950U using Tapatalk

  5. #5
    Boolit Buddy
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    https://bobp.cip-bobp.org/uploads/td...-en-page57.pdf Note the max pressure listed in your GRT window is 1500 BAR converted to 21756PSI. If you change the max pressure in your window to 17000psi, GRT will warn you that you're over max pressure. I tried to match the other settings that you have input, but you should double check. Click image for larger version. 

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    CIP site
    https://bobp.cip-bobp.org/en/tdcc_pu...rtridge_id=801
    Last edited by jreidthompson1; 05-20-2022 at 02:14 PM.

  6. #6
    Boolit Master
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    I’ve seen the same thing with True Blue powder in .45 Colt - at max book load it gives around 8ksi pressure. However, it matches book loads for .357 Mag with True Blue. This can be caused by the way GRT builds powder profiles - which only requires data from two different cartridges. This means that the way pressure affects burn rate cannot be accurately/completely captured or represented in GRT.
    *
    What I did with my .45 Colt loads is I considered the pressures as relative values (as opposed to absolute values) and did not go over 8ksi when changing to a different bullet or OACL. Worked for me, but I knew what I was risking. Also, my Uberti shows pressure signs as a particular screw will loosen before I get to 14ksi, which gives me a early & valuable warning sign. Tread lightly.
    *
    The best thing here is good on you for checking against a book load! Now if only different load books would all agree…
    I could be wrong - it happens at least daily.

  7. #7
    Boolit Grand Master popper's Avatar
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    I have found it works good for rifle and pistol. Beware, the seating depth it provides needs to be verified or changed to your value. I typically use Lee bullet data for my loads and vary seating depth.
    Whatever!

  8. #8
    Boolit Master ACC's Avatar
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    Anyone know where I can find the most up to date SAMMI specs?

    ACC

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  10. #10
    Boolit Master mehavey's Avatar
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    "...ultimately worthless at predicting safe loads, especially in handgun rounds."
    Pick/load for data at mid-point of pressure regime.
    Chronograph it.
    Adjust "effective" burn rate to match that velocity & observe resultant pressure curve.
    You now have a pretty fair/safe predictive tool for that family of bullet/powder as point of departure.

    `Do it all the time w/ QuickLoad & any/all straightwall case cartridges

  11. #11
    Boolit Master ACC's Avatar
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    Any standards newer than 2015?

    ACC

  12. #12
    Boolit Master mehavey's Avatar
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    What are you looking for ?
    https://saami.org/technical-informat...ami-standards/ are the current standards.
    And except for brand new cartridges where new standards are just now set, I know of no changes of consequence.
    Last edited by mehavey; 05-24-2022 at 06:49 PM.

  13. #13
    Boolit Master ACC's Avatar
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    Any body know how to convert CUP to psi?

    ACC

  14. #14
    Boolit Bub
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    Quote Originally Posted by ACC View Post
    Any body know how to convert CUP to psi?

    ACC
    Here's some interesting reading on the topic.

    https://www.shootingsoftware.com/ftp/psicuparticle2.pdf

  15. #15
    Boolit Master ACC's Avatar
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    That is some light reading!

    I hate math!

    ACC

  16. #16
    Boolit Master ACC's Avatar
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    Maybe someone can explain that to me.

    ACC

  17. #17
    Boolit Master mehavey's Avatar
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    There is no conversion... apple & oranges.
    SAAMI does have cartridge listings w/ both specs, though.
    https://saami.org/technical-informat...ami-standards/

    As to the referenced article, just go to page-4 and look at the graph.
    https://www.shootingsoftware.com/ftp/psicuparticle2.pdf
    `nuff said,

  18. #18
    Boolit Buddy
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    This may be of interest also. CIP and SAAMI piezo and copper crusher values for numerous cartridges. A number of them are comparable.

    http://kwk.us/pressures.html

    Sent from my SM-G781V using Tapatalk

  19. #19
    Boolit Master ACC's Avatar
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  20. #20
    Boolit Buddy
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    It says 14000 cup =3322 psi so I don't think it's valid

    Sent from my SM-G781V using Tapatalk

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check