Where’s the lead go?

[ChuckS1]

So when I size my oversized cast bullets in the lube sizer, where’s the lead that got removed go? Not that it matters, but got nothing better to think about while dinner’s cooking.

[725]

Squished into the boolit making the lube grooves smaller and the bullet longer. Doubtful it could me measured, but nothing is either created or destroyed, just changed. :)

[Land Owner]

^^^ +1 ^^^

It makes the driving bands longer, aids in obturating against the lands and grooves, though the base does the most of that work, and depending on where and how much is displaced, can impart a rotational instability, but measuring that prior to sending it down range is (other than visually) problematic.

[Ateam]

boolit gets longer.

[Bazoo]

If you size down .005 or more you can see a waviness in the edge of the lube groove.

[Martin Luber]

It's called the Poisson effect. You can demonstrate it with almost any material that you can squeeze

[farmbif]

do you see small clumps or rings of lube with black line in it? that's the lead that gets shaved off

[MarkP]

Constant volume

D1^2 * L1 = D2^2 * L2

Solve for New length:

L2 = D1^2*L1/D2^2 (D1 squared) multiplied by L1 divided by D2 squared do not need to worry about PI (3.14) as it cancels out when dividing the areas.

example 0.360 sized to 0.355

D1 = 0.360
D2 = 0.355
L1 = 0.800
L2=?


.1296 * .8 / .1265 = .823"

This also works for predicting case growth when necking down or length shrinkage when necking up. Little more complicated as the area of the neck is a ring I.D. & O.D. (inside and outside diameters 1 & 2)

[Bazoo]

I can’t even balance a checkbook, much less do math like that.

[M-Tecs]

So when I size my oversized cast bullets in the lube sizer, where’s the lead that got removed go? Not that it matters, but got nothing better to think about while dinner’s cooking.

It doesn't get removed. It does get moved or displaced. Easy enough to check. Weigh one then size and weigh it again.

[GregLaROCHE]

Once I tried to successively down size a boolit as much as possible. The lube grooves almost completely disappeared and there were thin fins, like the winglets you get when a mold isn’t completely closed, trailing off the base.

[Bazoo]

I’ve successfully sized .008.

[corbinace]

Constant volume

D1^2 * L1 = D2^2 * L2

Solve for New length:

L2 = D1^2*L1/D2^2 (D1 squared) multiplied by L1 divided by D2 squared do not need to worry about PI (3.14) as it cancels out when dividing the areas.

example 0.360 sized to 0.355

D1 = 0.360
D2 = 0.355
L1 = 0.800
L2=?


.1296 * .8 / .1265 = .823"

This also works for predicting case growth when necking down or length shrinkage when necking up. Little more complicated as the area of the neck is a ring I.D. & O.D. (inside and outside diameters 1 & 2)

Formulas are magic...Unfortunately I only know a few such spells. Thank you for sharing your knowledge with us.

[Targa]

I can’t even balance a checkbook, much less do math like that.
:) glad I’m not the only one.

[missionary5155]

I used to love math problems. Now we check the monthly statement and be sure there are not extra withdrawls.

[Land Owner]

Well played MarkP. Well played. I had not thought about that.

[dverna]

Constant volume

D1^2 * L1 = D2^2 * L2

Solve for New length:

L2 = D1^2*L1/D2^2 (D1 squared) multiplied by L1 divided by D2 squared do not need to worry about PI (3.14) as it cancels out when dividing the areas.

example 0.360 sized to 0.355

D1 = 0.360
D2 = 0.355
L1 = 0.800
L2=?


.1296 * .8 / .1265 = .823"

This also works for predicting case growth when necking down or length shrinkage when necking up. Little more complicated as the area of the neck is a ring I.D. & O.D. (inside and outside diameters 1 & 2)

Incorrect.

Lead displaced into the lube grooves or GC shank does not add to the increase in length.

[Smoke4320]

Constant volume

D1^2 * L1 = D2^2 * L2

Solve for New length:

L2 = D1^2*L1/D2^2 (D1 squared) multiplied by L1 divided by D2 squared do not need to worry about PI (3.14) as it cancels out when dividing the areas.

example 0.360 sized to 0.355

D1 = 0.360
D2 = 0.355
L1 = 0.800
L2=?


.1296 * .8 / .1265 = .823"

This also works for predicting case growth when necking down or length shrinkage when necking up. Little more complicated as the area of the neck is a ring I.D. & O.D. (inside and outside diameters 1 & 2)


Living near the border of South Carolina I have been introduced to a much simpler math.
It was a Nats hair length now its a Flys hair. so it done growed :) :)

[Mal Paso]

Friction Loss. Just like electricity and motors. That's why you're always short a couple Boolits from a pot of lead. You think these process are free?









LOL

[David2011]

A commercial caster I know once accidentally ran a 44 cal boolit through his air powered sizer while it had a .40 die in it. The boolit got realllly long.