my method of reducing flash hole size

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TheRodDoc

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cut block for nipple to sit into. made mine from a chunk of 4130 chrome moly steel in the milling machine.

place nipple into block with flash hole up. set a 3/16" to 1/4" bearing ball on flash hole and put in hyd, press. i went from .026" to .022". didn't seem to distort threads enough to make any difference.
 
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TheRodDoc said:
cut block for nipple to sit into. made mine from a chunk of 4130 chrome moly steel in the milling machine.

place nipple into block with flash hole up. set a 3/16" to 1/4" bearing ball on flash hole and put in hyd, press. i went from .026" to .022". didn't seem to distort threads enough to make any difference.
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Good idea, I well try that on a few sets of nipples. How much pressure did you use?
 
Sounds like a short term fix to me. The pressure is merely swaging a lip of metal into the flash hole and the gases will erode that out faster then if it were a solid column. A better fix might be to store the "COLT" cones in a sfae place and use Trescos or cones of your choice. Another solution that I have used is to turn the cones down to fit a smaller cap. At that point, I lay in a supply of caps to last me until the cones need to be replaced, usually 6 thousand or so.
 
I generally use Remington No. 11's, but understand that actual cap sizes can vary considerably. What works today may not work next month with a different batch of the same brand and size. You don't get 3 digit precision for 4 cents.
 
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