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Thread: Lead alloy calculators

  1. #261
    Boolit Mold
    Join Date
    Feb 2014
    Posts
    4
    Why does this calculator have pure lead coming up at a BHN of 8.6? If I put in 10 pounds of pure lead, by itself, the estimated BHN comes up at 8.6, instead of 5 as it should be.

  2. #262
    Boolit Master

    alamogunr's Avatar
    Join Date
    Mar 2005
    Location
    Tennessee
    Posts
    3,211
    See the previous post(260).
    John
    W.TN

  3. #263
    This was helpful

  4. #264
    Boolit Bub
    Join Date
    Jan 2012
    Posts
    36
    Quote Originally Posted by white eagle View Post
    no the calculator
    so you can use the thing for what ?
    I can't seem to figure this out
    does it just tell you what certain BHN values are or can
    you figure out mixes and alloys
    I usually mix 40:1 for my shotgun slugs. I use the calculator to determine how much pure lead and how much 63/37 solder bar to use to make 20 lbs of alloy

  5. #265
    Has anyone tried this?

    https://www.youtube.com/watch?v=7Y0raK6_Vbk

    May have to try on the next batch.....

    catmasher

  6. #266
    Boolit Master reloader28's Avatar
    Join Date
    Dec 2009
    Location
    nw wyoming
    Posts
    1,255
    Quote Originally Posted by catmasher View Post
    Has anyone tried this?

    https://www.youtube.com/watch?v=7Y0raK6_Vbk

    May have to try on the next batch.....

    catmasher



    That is a cool simple formula

  7. #267
    Boolit Mold
    Join Date
    Jun 2018
    Posts
    14
    First of all, thanks to everyone for all the knowledge.
    I've been reloading for some time but haven't cast before. My dad always did, and still does. Mostly black powder and some six-guns.
    Now, me?...well...I like to shoot and I like to play with things that make it possible for me to shoot more...for less dough.
    This, now, led me on a quest for being a cheap-o (cheap-o...er?).

    I've found a great site for bullets. $0.082/rd of .223 FMJ BT...not bad. (have to buy 1,000)
    This brought me down to $0.18/rd, from $0.42/rd...not bad.

    Same place offers defective lead cores at 2.5-3%Sb for about $1.65/lb

    I suspect I have a touch of OCD, like elvis ammo. hehe
    Anyway, I get ahold of a thing and I have to be on top of it before I can let go.

    My dad now, he just melts whatever and shoots it. And that's cool. But, my rifle is high velocity (223) compared to what he loads for.

    So, I had to research a bit more and learned about powder coat.

    Learned that there's some big differences in alloys...

    Seems that stuff needs a little Sn added, so it doesn't pour like a wet dog turd on a cold day.

    Learned a ****-ton of stuff...

    And the majority of my searches lead back to this forum.

    Now, it's been a long time since highschool and my math is rusty, so this took me a while to write.

    I apologize (and feel stupid) if someone already did this...but...

    Here's a formula for mixing two binary alloys.


    N=TOTAL # OF PARTS, WHERE THERE IS ALWAYS 1 PART OF A
    D=DESIRED PERCENT
    C=CURRENT SATURATION% OF THE BASE ALLOY
    A=ADDITIVE%
    N=(A-C)/(D-C)

    Example: (we'll assume the base is 2.5% antimony because we don't want to have more tin than antimony. A titch more antimony than tin won't hurt though.)
    We will approximate lyman#2

    D=5
    C=2.5
    A=30 (super hard alloy)

    N=(30-2.5)/(5-2.5)
    N=(27.5)/(2.5)
    N=11

    So, total number of parts=11
    10 parts base and 1 part additive, in this case gives 5% antimony. (check it out with the calculator)

    Now we need some tin...5%


    Simply remove 5% of the base from the total parts and add 5% tin...that's fairly close.
    Then take 10% of the amount of tin from the base and add that much to the additive...that's **** close. [so, -10%(5)of base and +10%(5) of additive [in this case}]

    But, in reality, you can just figure what 5% of the total mix is, take that much out of the base, and add in the tin, and that's close enough for what we're trying to do here.
    Last edited by sureYnot; 06-02-2018 at 08:59 PM. Reason: grammar

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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