.50 Cal Casing and bullet design

Engine Room Artificer · Dec 14, 2007

Gents,

Another favour, I've been anked to produce 2 x .50 cal shells for a static display out of solid brass. I have a casing as a pattern but no bullet.

Could somebody please give me an idea of how the bullet should look, ie length protruding from casing, angle and radius of curve if any. Also is it sharp or slightly rounded.

I've guestimated the taper of the casing to be about 1 in 40 or 1 deg 25 mins, does that sound about right?

Thanks in advance

Al

abarnsley · Dec 14, 2007

For something as precise as that you can scale a 30-06 cartridge up (thats what the Army did after many different designs for the round were tried...)

Simple was better...

Quick measurements of loaded API round dated 1945
Bullet Length protruding from case mouth 1.550

The primitive system of turning to proper dia and blending with file should be good enough for display

Could make one this way, and then make a form tool.....

Diameter of bullet at case mouth and every.100 toward tip
.510 at case mouth
.510
.510
.509
.502
.491
.481
.461
.438
.399
.372
.331
.290
.242
.197
.160
tip is a small flat .096

Dirtdobber · Dec 14, 2007

50 Bmg?

Here's spitzer ogive formula
http://www.corbins.com/specs.htm#spitzer
Here's case dimensions
http://en.wikipedia.org/wiki/Image:50_bmg_12.7x99.PNG

meplat data not given

homemade · Dec 16, 2007

maybe you should try to convince the boys that since a dummy round with an original brass case and an original copper alloy jacketed steel core bullet would be more authentic they should go with such, brightly polished and lacquered.

Engine Room Artificer · Dec 16, 2007

The completed shells are to be a part of the wall mounting plate for a gold plated AK47 liberated fro Iraq I believe. The primer end is to be tapped so it can be screwed from behind to point outwards from the hardwood plaque. The weapon will rest on the shells, I've only been asked to make the shells but being me want to get it to look as correct as possible and in the correct proportion. This will stay on base and will be seen by military people who know what they should look like.

Thanks for the replies and interest, I'll try and post pictures of the completed items when I get round to them later in the week.

Al

Engine Room Artificer · Dec 17, 2007

@Tis done.

Many thanks for your help, I stepped the bullet out as shown and profiled it with file and emery:

All that's left to do know is polish and perhaps lacquer, I'm quite pleased with how they've turned out.

Al

J.Ramsey · Dec 17, 2007

Very authentic looking,nice work.

abarnsley · Dec 17, 2007

Yup, Came out nice

Bullet Ogive looks just right

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