Drawing down .45APC case to.4375

September 30, 2014 11:37

Drawing down .45 ACP, or .308 brass down to .4375

Then drop in a lead core & swage up to .458 ...

making a trial die & punch to work the cases--see if they need annealing,etc.
Gonna have a starting section about 1" long, slip fit on .45 ACP case
then the forcing cone??? down to .4375

Question: what should be the entrance angle & length of the remaining
.4375 section ??
Made sumpin like this 50 yrs ago, but lost it & fergot how..

45-70 0n a Jap Arisaka 6.5 action

Jerry

then

Comments

11 comments

MG1890

September 30, 2014 11:48
I'm confused - how long and final diameter change?

Angle is easy with these 2 pieces of info.....
0
Twowings2U

September 30, 2014 21:04
to mg90

The drawing die will be approx 2.5" long overall
The starting section will be aprox .472 O X 1.2" long. (slip fit on
fired 45ACP case.
Then we come to the drawing down section, where the brass is squeezed down & exits into the finished size (.4375 O X 1.2" long

What is the shape of the junction of these two diameters??

Look at it thisaway--I'm gonna drill/ream a hole .4375O" all the way through a piece of steelapprox 2.5" long.
Then I'll ream a hole .472O half way--

What should be the shape of the cutting end of the larger reamer???

Thanks for your interest

Jerry
0
charliemeyer007

September 30, 2014 22:43
I would think that a half inch at your final diameter would be way more than enough. O.490

I think I would make a brass pilot bushing of sorts to fit over the small end of this reamer.

Brand: Alvord Polk
Mfr Part #: 18063
Price: $108.00 ea.
Taper Size Designation 4
Small End Diameter (Decimal Inch) 0.3474
Reamer Diameter (Decimal Inch) 0.5017
Reamer Function Finishing
Flute Length (Inch) 3-11/16

http://www.mscdirect.com/browse/tn/Holemaking/Reamers/Taper-Reamers/Brown-Sharpe-Taper-Reamers?navid=12106299
0
Twowings2U

October 01, 2014 07:10
I"m trying to make .458 bullet jackets out of 45acp or .308 fired cases.

If I use the .308 cases, they will have to be trimmed off to 1.2"? long
0
Twowings2U

October 01, 2014 07:33
What I"m trying to do is make bullet jackets from used .45ACP or.308 used brass shell casings.

I first have to shrink them down, press in a lead core,and then
swage them up to .458

I feel like there is a short, Ideal shaped transition from .475O to
.4375O which will minimize the effort and produce the least work
hardening of the brass
0
MG1890

October 01, 2014 08:35
Hi,
So, the remaining (2.500" - 1.200") length is 1.300", with a .0345" diameter change. Solving for this angle yields .5847 degrees per side, or 1.1696 degrees inclusive angle.

Greg
0
Mobuck

October 02, 2014 02:38
Are you going to push them through the die mouth first or head first?I would think concentricity would be better if you used a spud inside the case to push it through base first.
0
Twowings2U

October 02, 2014 07:05
Mobuck

Yes,head first, with a tapered sleeve to center the open end of the case
if necessary .
0
Mobuck

October 04, 2014 10:09
The shorter you make the transition(funnel) the more likely the case will be to cant or enter the taper cock-eyed. A longer taper with a short parallel at beginning and end would be my suggestion.
0
Twowings2U

October 10, 2014 11:43
AHA, Finally an answer to the question--Thank You Mobuck.
0
v35

November 05, 2014 20:31
Why are you sizing down then sizing up?
The chance of cocking a .437 slug in a .458 die would be avoided by sizing down a .495 slug (lead +brass) assembly in one or two stages to .458.
I'd start with fully annealed brass sized in a 45acp fl die.
0

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Drawing down .45APC case to.4375

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