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Very Hot Topic (More than 25 Replies) My 32 cal x 357 mag fixed chamber and case attempt (Read 1201 times)
tdmidget
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #15 - Sep 9th, 2017 at 1:44pm
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To cure your problem at the botleneck just make a single lip cutter, called a "D" reamer by some. Turn the exact profile of the cartridge and grind off slightly less than half. Harden, polish and feed slowly , peck often as there is very little room for chips. Done well it leaves a beautiful finish  and exact profile.
  
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tdmidget
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #16 - Sep 9th, 2017 at 1:45pm
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To cure your problem at the bottleneck just make a single lip cutter, called a "D" reamer by some. Turn the exact profile of the cartridge and grind off slightly less than half. Harden, polish and feed slowly , peck often as there is very little room for chips. Done well it leaves a beautiful finish  and exact profile.
  
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corerftech
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #17 - Sep 9th, 2017 at 3:19pm
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I have A2 and W1 and O1 for tool steel stock in correct diameter.
Which is best for a reamer of this type?
I know about it, just afraid to do it.... but since IM hacking old barrels right now, I can't hurt anything of value, just wasted time and I have time!

Please advise
  
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Marlene
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #18 - Sep 9th, 2017 at 5:14pm
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A2 easiest to deal with for obvious reasons, but W1 will have the least surface decarburization, so use that if you're not going to knock off the surface after hardening. I never bother tempering these.
  
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craigd
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #19 - Sep 9th, 2017 at 10:43pm
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Only thoughts. All three of those steels can be difficult to heat treat well. If it's heat up and dunk in used motor oil heat treating, O1 may be easier to do than W1. If you can control the environment, then you may get less distortion with A1, if you think you have some critical dimension that you'd like to maintain. Best of luck with it.
  
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beltfed
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #20 - Sep 10th, 2017 at 11:10pm
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As was mentioned earlier, a 30 cal rimmed 300 BO
of different lengths, and different shoulder lengths
is easily done on 357Mag, or 357 Maxi brass with a
std set of Lee 300 BO dies.
Renting a 300 BO reamer could cut you a basic chamber body with the nice shoulder you are looking for.
For your purposes, you could then go in and recut the neck and leade with your 32 cal neck/throat reamer.
Viola, done.
See attached PIC of the 300BO(the rimless case near middle)
along with sized 357Mag, and two variants of sized 357Maxi-
One with long neck for long body cast bullets and the other
shorter neck for CBs such as the 311299.
beltfed/arnie
  
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beltfed
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #21 - Sep 10th, 2017 at 11:11pm
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Oh, a 30 carbine and a 3220 on left for comparison.
beltfed/arnie
  
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corerftech
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #22 - Sep 10th, 2017 at 11:41pm
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Arnie: I missed the 30 carbine (even though I started a thread maybe a year ago re: making 32 long colt form 30 carbine). Checked the reamer print on 30 carbine at elk ridge.
The reamer cuts a .3386 at the font end.

Its the right length to do the neck and throat.

Its under sized a couple thou for the .325 bullet plus 38/357 neck at .0095

I need a conservative .348 neck

I can't find anything that suits that.

32-44 likely gets it there, but reamer is not long enough o get in to the neck region

My custom neck/throat was set up for .339 (32-20 neck walls plus .323) and a tight neck.

I like the rimmed 300 BO though.
  
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beltfed
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #23 - Sep 11th, 2017 at 9:31am
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Actually, the 30 carbine case was only in my Pic for comparison,as is the 32-20.
Of course, as you have been doing, a person looks at
all available alternatives in doing such a chambering with minimal expense. Been there done that.
My main suggestion is indeed the rimmed 300 BO concept
that you might change to a rimmed 32 BO, short off 357Mag
or long off 357Maxi
Also, if one did this, you  would want to use a floating pilot 300BO reamer, with an appropriate "32" cal pilot in place.

beltfed/arnie
  
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beltfed
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #24 - Sep 11th, 2017 at 9:37am
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I have been looking at the rimmed 300BO idea for a possible
30 cal  Schuetzen ctg off the readily available 357Mag or Maxi brass. I have a raft of 30 cal bullet molds to play with.
beltfed/arnie
  
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Green_Frog
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #25 - Sep 11th, 2017 at 10:15am
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Corerftech, I was told that when Charlie Dell designed his version of the 32/357 Mag he made his reamer from a straight taper reamer. Of course he was all about breech seating, but I'm told he made a fixed version of the cartridge by simply reaming the inside of the case neck to accept the bullet to the desired depth. 

If I were pursuing the cartridge you describe, And if I were only making one chamber and one forming die, I would probably use a tapered reamer for the cartridge body, then a straight reamer to get the neck section I wanted.  But then again, I'd probably be having somebody do it for me, so what do I know?  Cheesy

Froggie
  
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #26 - Sep 11th, 2017 at 4:10pm
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Don't ignore the 30-30 Wesson.  Made from a .357 Max, necked down (tapered) to .30 cal.  About the right capacity that is being discussed here.

AND is of histerically correct for those that are traditionalists.  (about 1880 vintage) 

  

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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #27 - Sep 12th, 2017 at 12:33am
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A #7 taper pin reamer can be modified to make the 32/357 (Dell), or the same case on the maxi if the rear of the reamer is ground to ~.380-.

Willis
  

Willis Gregory, aka singleshot
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corerftech
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Re: My 32 cal x 357 mag fixed chamber and case attempt
Reply #28 - Sep 17th, 2017 at 6:38pm
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Made progress today on the project.

Finalized the shoulder location, neck length, dies process, neck dimension and bullet final sized diameter.
Case is 357 mag.
The bullet will be a .3275 at both bands, RCBS cadet 310-120 modified.
That will fill the .326 potential groove nicely.

The neck will be .3495 for insurance
The datum point is 1.000 from breach face
The shoulder and neck to be sized in an 8 nambu die with a .345 neck
Bullets are a slip fit in unmodified 357 mag cases, meaning they slip in under modest finger pressure w/o any sizing or dimensional changes to bullet until the top band is 50% inserted. Final seating is done with a 32-20 seater (for now).
No belling required.

8 nambu die FL sizer is capable of generating a taper crimp of any depth applicable but since there is the tiniest bit of neck tension which is adjustable with the lee universal expander plugs Ive turned to the Lyman M- Die profile to suit the needed neck, I can get it tighter very easy, should not need any crimp.

Testing when crimp was added, it sized almost a full .0005 from the base band and .001 from the froward band. Those are intolerable losses at this point since a custom mold with a proper located and dimensioned crimp groove is not avail.

So quasi Fl size is:
357 mag carbide for body.
8 nambu .344 neck
Custom made lee univ exp. plug at .328
seat with anything having the right stem the last .050
Crimp in 8 nambu FL size if needed.

Resize neck and push shoulder as needed with either 8 nambu basic or 8 nambu .344 (once ordered)

Ill order a manson .3495 neck reamer Monday.
Lathe bore the body easily single point with a goofy shoulder relief cut so its not sharp (ala Marlene suggestion)
Throat with a standard 8mm rifle throater.

Im close to shooting it (well sort of.)

Assembled rounds go together like peanut butter and jelly.

Bypassing the 32/40 variant for now, will return to it after move. Maybe it becomes a breach seat version since case capacity will be limited as fixed, compared to 357 mag bottle neck.
  
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