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Posted: 10/24/2011 3:33:06 AM EDT
I know i am opening a can of worms asking this question....but here it goes. I am wanting to do a wilcat cartridge as i have access to all the cnc equipment to make my own dies. The machining knowledge is there....but....the actual knowledge of making the die to conform to the size i am wanting to achieve is another. How much undersize do i make the die to figure in springback in the brass Or do i make it to the exact case dimensions Also..... How do i know where to start with the powder charge Case volume is pretty much unknown unless i measure it with water and convert it somehow What powder to use Primer (standard/magnum)
Man i think i just opened up a can of worms!!!! It would probably be easier if someone could hook me up with a website and or a good wildcat book if you know of any. I am looking into a book right now in the midway catalog called "Wildcat Cartridges"... What ya guys think And thanks for any input!!!
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There are program for designing cartridge cases, I use the case designer in my RCBS.Load program and once all dimension are entered it gives you the case volume, it also has a complete list of factory cartridges to use at the reference cartridge and then you can adjust from there.
Here is a cartridge I recently designed and am still working on, the final design differs from this a bit but you get the picture. 
Once the cartridge is designed I can use Quick Load to figure the internial ballistics to get a good ideal of what to expect performance wise and which powders will work best and how much to use. As far as the dies i would just call Hornady and ask what the standard is for dimension reduction for properly sizing a case, I would think chamber dimension -.004"-.006" would be close. |
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That assumes you have a chamber cut using a reaer. If you have a roughing reamer cut also, it is usually almost perfect for full length sizing dies. If you want to neck size you can use the finish reamer to alter the slidding sleeve in a Redding competition die (they sleeve is not hardened) and then use nech bushings. |
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