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Hot Topic (More than 10 Replies) 40-82 Win. modified cases (Read 4560 times)
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.

beltfed/arnie
  
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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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