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Thread: BHN after powder coating

  1. #21
    Boolit Bub
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    Sep 2009
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    I was able to get a Lee Hardness Tester, and after checking - air cooled @ 13.4 and air cooled PC @ 13.9 it looks like there is no softening to be concerned about.
    I'm going to test the air cooled/water dropped pc next.
    Thanks everyone.

  2. #22
    Boolit Bub
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    Quote Originally Posted by MR CHEN View Post
    I was able to get a Lee Hardness Tester, and after checking - air cooled @ 13.4 and air cooled PC @ 13.9 it looks like there is no softening to be concerned about.
    I'm going to test the air cooled/water dropped pc next.
    Thanks everyone.
    thank you another myth busting.

  3. #23
    Boolit Grand Master fredj338's Avatar
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    Quote Originally Posted by MR CHEN View Post
    It looks like I have 4 that say no (will not soften) 1 yes, and five off topic.
    IT does soften the alloy a bit, if you water dropped out of the mold. Easy enough for anyone to test.
    EVERY GOOD SHOOTER NEEDS TO BE A HANDLOADER.
    NRA Cert. Inst. Met. Reloading & Basic Pistol

  4. #24
    Boolit Buddy mehavey's Avatar
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    If cast air-cooled to start/before PC'g
    it will be exactly the same after air-cooled PC'g

    (Make that Five saying No Difference)

  5. #25
    Boolit Bub
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    Can anyone 'splain to me the difference in the chart on page one of water cooled (showing a BHN of 27) and a quenched cast/quenched PC (showing only 24 BHN). Is this showing the loss in quenching from only 400 degrees on the PC step, whereas the original quenching (water cooling) would have been from 700 degrees +/-.

  6. #26
    Boolit Master
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    ya heat treating from a higher temp makes harder boolits. then reheating in the oven resets it to be heat treated at a lower temp this time in the water. but from the mold is probably like 475 ish by the time it hits the water, at 700 youd be pouring liquid from the mold

  7. #27
    Boolit Bub
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    Quote Originally Posted by bmortell View Post
    ya heat treating from a higher temp makes harder boolits. then reheating in the oven resets it to be heat treated at a lower temp this time in the water. but from the mold is probably like 475 ish by the time it hits the water, at 700 youd be pouring liquid from the mold
    Uhhhhhhh, there's that. But, ya know what I meant.

  8. #28
    Boolit Bub
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    As I stated in post #21, "I'm going to test the air cooled/water dropped pc next".
    It didn't go so well. I dropped right out of the oven, waited a day then measured for hardness and saw no increase in BHN.
    Right out of the oven I tell ya! What could be wrong?

  9. #29
    Boolit Grand Master tazman's Avatar
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    I would have expected the antimony in the wheelweights to cause at least SOME hardening when quenched. When I water drop wheelweight lead, it gets much harder than air cooled. How much, I can't say. I don't have a tester.
    I can scratch the air cooled boolits with my fingernail but not the quenched ones.
    I have to wonder if you are testing the hardness of the PC coating as opposed to the lead?
    I am not familiar with the process of lead hardness testing so perhaps my question is a bit on the ignorant side.

  10. #30
    Boolit Master
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    it deffinitly works I do it with almost everything I shoot, towards the end of cooking I get it up to 425 for a few minutes, then fast as I can take the tray out and throw it in bucket with some ice water. then let em sit for a week to get hard. I expansion tested after 1 day before and it showed there harder than air cooled but not as hard as aged it takes time. I use half ww half pure and they get pretty hard, pure even harder

    you can always put em back in the oven if you need to, nothing is lost either way

  11. #31
    Boolit Master
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    pure even harder
    I've never heard of pure lead getting hard after water dropping unless antimony is added.

  12. #32
    Boolit Master
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    Oct 2013
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    ah, pure as in pure wheel weights instead of half and half lol

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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