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See https://castboolits.gunloads.com/showthread.php?451263-%93Soft-point-hardcast%94&p=5506686&viewfull=1#post5506686

30-1 is "effectively" pure lead. Held to anything short of magnum pressures, ...

44 mag came out in 1955.
357 came out in 1935... so he "could" have been on the cusp of discussing that cartridge in 1936

As far as 10-1 goes, 50-50 is only BHN 9 (tested), so 10-to-1 isn't going...

Calibration folks.

30-1 is BHN 5.8 -- Tested by myself*and metallurgical Lab/Atlanta earlier this year. (RotoMetals composition verified at same time)
20-1 is BHN 7.8 -- Tested by myself* using...

Waaaaay too (unnecessarily :p)hard.
Go with 0.380"/30-1 (BHN 5.8) and obturate early just as the article indicates.
https://thefiringline.com/forums/showpost.php?p=6657922&postcount=1

Note:...

- Shot a moderate (BP) velocities -- ideal w/ conventional lube and/or ALOX
- Powder coat it for (~)20-25% greater delta-V while retaining advantages of obturation and expansion

See https://castboolits.gunloads.com/showthread.php?452304-45-acp-super-soft-bhn-experiment&p=5521279&viewfull=1#post5521279

1-16 is about BHN 8.2 (tested)

Note: Adding Tin to a binary lead-tin...

Unless you're grossly resizing (like 458 --> 452) I've never found lube req'd.
- Just run Hornady 1-shot into the die to clean.
- Dry out thoroughly w/ twisted-up paper towel.
- Size . . .

But...

See https://thefiringline.com/forums/showpost.php?p=6895385&postcount=2

(FWIW, Claybuster still sells the WAA12R equivalent)

One of the reasons Lead/Tin alloys give good expansion is that that they are soft -- even at high (and expensive) tin ratios.
When actually measured/tested for hardness, 30-1 is ~BHN 5.8, and 20-1...

^^^^ THIS ^^^^

However in the 45 ACP, it can work well at target velocities:...

See: https://castboolits.gunloads.com/showthread.php?446264-Subsonic-350-Legend&p=5457368&viewfull=1#post5457368

- Is that in fact Eastwood black chrome?
- Could you (please) post a pic of the result ?

To be honest, the Lee Universal Flaring Die does it all -- all calibers.
Specific M-Dies are great, but get the Flaring die no matter what

What are you sizing it to after coating?
(Note: I'm running three different 147gr/Powdercoated bullets through 9 different 9mm's -- sized .357 -- no issues.)
(Multiple SIGs, Glocks, M&Ps, and a...

Smoke's is (are?) tried & true
Eastwood:
- Red Mirror
- Flame Red translucent
- Green Mirror
- Ford Light Blue
- Single-Stage Chrome
- Extreme Chrome
- Popping Silver
. . . . . . are all...

Has the OP looked at Alliant (BE-86/Sports Pistol) data?
https://www.alliantpowder.com/reloaders/recipedetail.aspx?gtypeid=1&weight=185&shellid=35&bulletid=334

"Hardcast" without an actual BHN# is absolutely meaningless.
(Caveat emptor comes to mind)

I powder coat most every thing now....
except bore riders.

Those I deliberately ALOX to great effect.
https://thefiringline.com/forums/showpost.php?p=6682694&postcount=6

See https://castboolits.gunloads.com/showthread.php?465089-The-Old-Argument-Actual-Brinell-Measurement-Hardness&p=5709226&viewfull=1#post5709226

There are likely other testing options/suggestions...

With the (Lee) die super-clean, no issues w/ bare lead
(within reasonable 2-3 thou)

Just make sure to regularly clean out the cylinders after a lot of 38 brass -- prevent
carbon buildup at the mouth of the shorter case leading to 357 chambering problems.

$2.69
https://www.rotometals.com/lead-mini-ingot-pure-99-9-1-pound-mix-sizes/
:holysheep

Pictures 1 & 2 look perfectomundo:bigsmyl2:, pic 3 a little cold yet
(but certainly just as perfectly shootable no problemmo at all.)
[smilie=p:

CONGRATS !

^^^^ :killingpc ^^^^
^^:groner: ^^

(That said....)

Given that "burn rates" as usually listed in the various rainbow charts are only the start-point rates...
... and those rates change with...

See above belief that (true 90/5/5) Lyman #2 is not affected by quenching.
...and that I would re-check.

I recast both air cooled and fast-quench (direct from hot mold into ice water) RotoMetals...