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Taos NM
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June 1, 2024 - 11:16 am
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Hi–Wondering if anyone is making this from 45-90 Brass–I would like to purchase 40–Thanks Bill

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June 1, 2024 - 3:23 pm
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The conversion book says to use 45 Basic brass.  The rim on the 45-90 is too thick and too small in diameter.   The 45-90 head/base diameter is too small in diameter.

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June 2, 2024 - 6:39 am
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Chuck said
The conversion book says to use 45 Basic brass.

Which Book are you referring to?

Sincerely,

Maverick

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June 2, 2024 - 4:59 pm
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In support of what Chuck has mentioned, the published case dimensions for the 40-70 WCF are indeed different than the 45-90 WCF.  Specifically the rim diameter and the rim thickness.

 

40-70 W.C.F.

40-70-WCF-case-dimension.jpgImage Enlarger

 

 

45-70 (45-90 is 2.40″)

45-70-case-dimension.jpgImage Enlarger

WACA Historian & Board of Director Member #6571L
High-walls-1-002-C-reduced2.jpg

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June 2, 2024 - 8:14 pm
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 In Clyde Williamson’s book Winchester Lever Legacy on page 167 he shows a Winchester drawing of the WCF 40-70 dated 1912. It list the rim thickness .070″ and diameter at .608″, 45-90 the same on page 88, 40-82 the same Rim thickness but diameter .610″ on page 116. I have loaded all 86 caliber cartridges from 38-56 to 45-90 with 45-70 or stretched 45-70 without messing with the rim.

 I have bought cartridges made from 45 basic so I don’t know if they trimmed the rims. Williamson’s book has a RCBS drawing on page 75 that has different measurements, this is a modern drawing. His book tells the type of cases and how he did it, good reference. T/R 

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June 2, 2024 - 11:55 pm
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Maverick said

Chuck said

The conversion book says to use 45 Basic brass.

Which Book are you referring to?

Sincerely,

Maverick

  

The Handloader’s Manual of Cartridges Conversion  by John N. Donnelly.  I have an older green one and not sure which of the other 2 is the latest one?

 

https://www.google.com/search?client=firefox-b-1-d&q=handloaders+manual+of+cartridge+conversions

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June 2, 2024 - 11:55 pm
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TR 

I have Snooky’s book.

Was wondering which book Chuck was referring to?

Sincerely,

Maverick

Chuck you posted the answer before I hit send on my last post. Thanks for the info!

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