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KFW
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40-82 Win. modified cases
Sep 2nd, 2019 at 8:47am
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Somewhere I read that if one annealed 45-70 (2.1")brass first, then ran them into the 40-82 sizer die the case would grow to the required 2.4" length. Can someone validate that? I would rather modify my hoard of 45-70 cases than the more expensive 45-90 ones.
thanks
kw
  
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marlinguy
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Re: 40-82 Win. modified cases
Reply #1 - Sep 2nd, 2019 at 8:57am
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That's a lot of growth, and I can't see that much ever happening simply by annealing, and reforming to .40-82?
  
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art_ruggiero
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Re: 40-82 Win. modified cases
Reply #2 - Sep 2nd, 2019 at 11:09am
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no  no they will only stretch  about 030_  .040   art
  
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Reverend Al
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Re: 40-82 Win. modified cases
Reply #3 - Sep 2nd, 2019 at 2:25pm
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No, to stretch .45-70 cases to full .40-82 (.45-90) length you would need to use a case stretcher.  You would have to decide if the project is worth the cost to invest in the tool.  I bought one several years ago, but bought it with 3 sets of dies to stretch a variety of cases, so I felt it was worth the investment.

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KFW
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Re: 40-82 Win. modified cases
Reply #4 - Sep 2nd, 2019 at 3:14pm
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Revernd AL:

its a cool tool, but the working budget won't allow for it. It would be a one time use anyways. Sure wish I could remember where I read that you could get  2.4" out of a 45-70 case by from a sizing die.
  
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beltfed
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Re: 40-82 Win. modified cases
Reply #5 - Sep 2nd, 2019 at 6:34pm
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Bottom line. Most simply and probably most economically
to just buy the 45-90 brass and form it 
beltfed/arnie
  
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KFW
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Re: 40-82 Win. modified cases
Reply #6 - Sep 2nd, 2019 at 6:49pm
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Beltfed
yes, reworked 45-90 brass seems to be logical. The attached print from 4D Reamer ($34 rental) shows a .625 neck, (still going to verify that) so that should work even if I have to leave one lube groove exposed for best results. Have a look.
  
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beltfed
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Re: 40-82 Win. modified cases
Reply #7 - Sep 2nd, 2019 at 7:48pm
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KFW,
Time out while I get an example of an original 40-82 Win
ctg...
beltfed/arnie
  
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beltfed
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Re: 40-82 Win. modified cases
Reply #8 - Sep 2nd, 2019 at 9:40pm
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KFW,
that reamer drg does Not match Orig 40-82W dimensions.
Attached is a pic of Orig loaded and fired brass .
And it does not seem to match recent 40-82 variants
that were approved for NRA Silhouette,etc:
One of them is formed by running a 2.4" case into a 
40-65 die all the way. Result is about a 0.82" long neck
(unless this variant is trimmed back some before use- but then it would not still be about 2.4" long. 
The other is formed by running the 2.4" case intot the 40-65 die 0.3" short, resulting in a neck length about 0.52" long.
So the reamer pic you posted: I do not know what it really is. Someone's custom, I suppose
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beltfed
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Re: 40-82 Win. modified cases
Reply #9 - Sep 2nd, 2019 at 9:41pm
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Better PIC of the 40-82W cases and box
beltfed/arnie
  
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Re: 40-82 Win. modified cases
Reply #10 - Sep 3rd, 2019 at 2:13am
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That looks like a crossno 40/82 to me.
  
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beltfed
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Re: 40-82 Win. modified cases
Reply #11 - Sep 3rd, 2019 at 11:01am
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The reamer PIC is certainly close to The long neck version of the 40-82 "Silhouette". I just get mixed up whether that is the Crossno or "the other one" 
  
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beltfed
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Re: 40-82 Win. modified cases
Reply #12 - Sep 3rd, 2019 at 11:15am
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KFW,
I have to agree that the long neck reamer you showed,
would have its advantages with being able to get all or most of ggs into the neck. 
I believe that a 40-65 FL die may work as I had outlined above to partially size the 2.4 brass down to "match" the chamber neck/shoulder length.

At one time, I played with the idea to 
recut my 40-65 to a long neck 2.4 version. But, then again, I have had exlt performance with the existing 40-65 tight neck chamber. I seat my tapered GG or DDEPP bullets out and can get 75 gr Swiss 1.5 under them for 1400fps.
Stable and accurate to 1K out of the 16 twist barrel.

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KFW
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Re: 40-82 Win. modified cases
Reply #13 - Sep 3rd, 2019 at 12:14pm
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Thanks Arnie for all the good useful info, I will have plenty of thinking/fiddling/chambering to do soon getting the pipe chambered and getting the brass to go in for fire forming. Should have a barrel on its way today, waiting on a return call.
best
kw
  
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scharfe
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Re: 40-82 Win. modified cases
Reply #14 - Sep 3rd, 2019 at 12:23pm
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Doesn't The Home Guide to Cartridge Conversions by George C. Nonte have something on this ?
  
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