Case Stretching

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Raven
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Joined: Thu Apr 23, 2020 5:18 pm
Location: Scottsdale AZ

Case Stretching

Post by Raven »

What is the groups experience with Case stretching a 45-40 a few thousandths?

I see Buffalo Arms sells a stretcher. Anybody used it in this manner?
TexasMac
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Re: Case Stretching

Post by TexasMac »

NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
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Raven
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Location: Scottsdale AZ

Re: Case Stretching

Post by Raven »

Thanks. I ordered the Buffalo Arms unit.
Blackstone
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Re: Case Stretching

Post by Blackstone »

TexasMac wrote: Sun Dec 20, 2020 10:15 pm Here ya go.

http://www.texas-mac.com/Lengthening_Sh ... amber.html

Wayne
How far can you streach 30-40 brass with the kal-max tool
Blackstone
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Joined: Thu May 29, 2014 11:28 am

Re: Case Stretching

Post by Blackstone »

TexasMac wrote: Sun Dec 20, 2020 10:15 pm Here ya go.

http://www.texas-mac.com/Lengthening_Sh ... amber.html

Wayne
How far can you streach 30-40 brass with the kal-max tool
TexasMac
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Re: Case Stretching

Post by TexasMac »

Blackstone wrote: Thu Dec 24, 2020 8:15 pm
TexasMac wrote: Sun Dec 20, 2020 10:15 pm Here ya go.
http://www.texas-mac.com/Lengthening_Sh ... amber.html
Wayne
How far can you streach 30-40 brass with the kal-max tool
I assume you mean 30-40 Krag brass which has a shoulder. If so the Kal-Max stretcher will not work since it's designed to only stretch straight wall cases.

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
Blackstone
Posts: 63
Joined: Thu May 29, 2014 11:28 am

Re: Case Stretching

Post by Blackstone »

TexasMac wrote: Thu Dec 24, 2020 9:16 pm
Blackstone wrote: Thu Dec 24, 2020 8:15 pm
TexasMac wrote: Sun Dec 20, 2020 10:15 pm Here ya go.
http://www.texas-mac.com/Lengthening_Sh ... amber.html
Wayne
How far can you streach 30-40 brass with the kal-max tool
I assume you mean 30-40 Krag brass which has a shoulder. If so the Kal-Max stretcher will not work since it's designed to only stretch straight wall cases.

Wayne
Lol yes I'm talking about streaching it after its been blown out straight , to make 40-70
TexasMac
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Re: Case Stretching

Post by TexasMac »

Blackstone wrote: Thu Dec 24, 2020 9:44 pm
TexasMac wrote: Thu Dec 24, 2020 9:16 pm
Blackstone wrote: Thu Dec 24, 2020 8:15 pm
How far can you streach 30-40 brass with the kal-max tool
I assume you mean 30-40 Krag brass which has a shoulder. If so the Kal-Max stretcher will not work since it's designed to only stretch straight wall cases.
Wayne
Lol yes I'm talking about streaching it after its been blown out straight , to make 40-70
It would depend on the thickness of the walls around the middle of the case assuming the .40 cal Conversion Kit would work. I sold my Kal-Max setup some time ago or I'd offer to try it with a sample of your brass. I'm betting some of the members of this form have the Kal-Max and would be so kind as to make you the same offer. I know at one time someone was stretching brass with the Kal-Max for a reasonable fee.

So what say you guys that own a Kal-Max?

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
Blackstone
Posts: 63
Joined: Thu May 29, 2014 11:28 am

Re: Case Stretching

Post by Blackstone »

TexasMac wrote: Thu Dec 24, 2020 10:42 pm
Blackstone wrote: Thu Dec 24, 2020 9:44 pm
TexasMac wrote: Thu Dec 24, 2020 9:16 pm

I assume you mean 30-40 Krag brass which has a shoulder. If so the Kal-Max stretcher will not work since it's designed to only stretch straight wall cases.
Wayne
Lol yes I'm talking about streaching it after its been blown out straight , to make 40-70
It would depend on the thickness of the walls around the middle of the case assuming the .40 cal Conversion Kit would work. I sold my Kal-Max setup some time ago or I'd offer to try it with a sample of your brass. I'm betting some of the members of this form have the Kal-Max and would be so kind as to make you the same offer. I know at one time someone was stretching brass with the Kal-Max for a reasonable fee.

So what say you guys that own a Kal-Max?

Wayne
I have a kal max , but only have the 45 tools . I'm going to have to male 40 tooling . Was just wondering about streaching the brass .225 needed to reach 2.50
PacRATT
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Location: Winnipeg,MB,Canada

Re: Case Stretching

Post by PacRATT »

I’ve stretched 303 Brit. (2.210”) that are (2.160 to 2.180) when expanded to make 40-60 Maynard (2.220”) using a Kal-Max, then trimmed them to (2.200”). Worked just great.
semtav
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Location: Montana

Re: Case Stretching

Post by semtav »

I may be wrong, but I think one will be lucky to get much over .03-.04 out of a Kal-Max
I've stretched my 2.4" Starline to 2.430. but don't think it would ever go to 2.650.
mdeland
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Joined: Mon Nov 20, 2006 1:47 pm

Re: Case Stretching

Post by mdeland »

The good thing about nibbing is you draw metal from the entirety of the whole interior case wall , the web forward. I've nibbed 2.1 cases from 2.1 -2-6 and still had necks in the .009-010 thickness range.
Blackstone
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Joined: Thu May 29, 2014 11:28 am

Re: Case Stretching

Post by Blackstone »

mdeland wrote: Sun Dec 27, 2020 12:43 am The good thing about nibbing is you draw metal from the entirety of the whole interior case wall , the web forward. I've nibbed 2.1 cases from 2.1 -2-6 and still had necks in the .009-010 thickness range.
How do you go about nibbibg ?
Blackstone
Posts: 63
Joined: Thu May 29, 2014 11:28 am

Re: Case Stretching

Post by Blackstone »

mdeland wrote: Sun Dec 27, 2020 12:43 am The good thing about nibbing is you draw metal from the entirety of the whole interior case wall , the web forward. I've nibbed 2.1 cases from 2.1 -2-6 and still had necks in the .009-010 thickness range.
How do you go about nibbibg ?
mdeland
Posts: 11708
Joined: Mon Nov 20, 2006 1:47 pm

Re: Case Stretching

Post by mdeland »

You need a small lathe, then what I did was used an extra resizing die I had. I cut the top off the die then made a cap that screws on the bottom over the die threads. Put the sized brass in the die,screw on the cap to secure the case head then put the whole thing in the three jaw chuck of the lathe , top side (case mouth) out. Make sure the die interior is running true with as little run out as possible.
The nib is nothing but a boring bar with a ball bearing soldered in the end and corner into a milled socket. The compound on the lathe is set to the same angle as the case taper. The cross feed backs the nib into the case wall and the compound is used to withdraw the nib as it swages the brass radially on a spiral toward the mouth. Run the nib into the case to the web,turn on the machine and withdraw it on the compound feed.
It takes me about 3 pass depending on how long I want the case. If you want a thicker neck then don't nib it out any more than to get it even in thickness.
The cases. after nibbing, will show one side of the mouth longer than the rest of it, this is where the uneven brass wall thickness ends up.
Trim the mouth to the length your after and your ready to load.
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