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Old August 30, 2012, 02:34 PM   #29
Clark
Senior Member
 
Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 2,815
It sounds like I need more handgun testing.
I have found that rifles are noisy if the bullet does not seal with the lands. I can allow no gas to leak around the bullet during jump.
That is why I have the two presses on the same home made die with a ram between them, to swage the bullet into a sized and shape that seals the powder behind the bullet when jammed into the lands.

I clean the inside of the case and the outside of the filler [Steel or Aluminium ] with alcohol. Then put Loctite 601 on them. I press them together in a vise with a small socket wrench as a spacer.
None have come loose with 601, one came loose with just a press fit.

To cut the taper of the insert to be a press fit:
I measure the case wall thickness in .1" increments from the web.
I make a formula for slope and offset outside diameter for the case.
I put those in a spread sheet, print it out, and use the the DRO on the lathe and the chart to make my hands a crude CNC machine.

I like to drill the flash hole big enough for Red Dot flakes to fall down it.

I made a test fixture to measure sound.
Most people would be better off with a commercial sound pressure level detector and modify it for faster attack time to measure the sound of a gun shot.
Attached Images
File Type: jpg Peak sound detector pic b 8-11-2012.jpg (80.3 KB, 5 views)
File Type: jpg Sound peak detector drawing 8-11-2012.jpg (86.7 KB, 5 views)
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