superdude

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    St. Louis, MO
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    Brad Miller

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  1. It's still around at every place on the internet that I checked.
  2. what gun are you talking about? have you done the magic marker treatment to be absolutely sure where they are failing the plunk test?
  3. Do you intend to stay with 147 grain bullets? Folks might have suggestions for particular bullets depending on the weight you intend to use.
  4. Interesting. We're used to seeing oversized bores, but not too many undersized bores. Schuemann recommends a jacketed bullet of .001 to .002 inches larger than the bore, and lead bullets .002 to .003 inches larger for the best accuracy. Nowlin also suggests slightly oversize bullets.
  5. Use a magic marker to assess where they fail. It is explained here: http://www.shootingtimes.com/reloading/reloading-tips-the-plunk-test/
  6. Where/how/why were they failing? Part of the plunk test is to determine the cause of failure. Did you do that?
  7. Nosedive is a complicated issue. First, they might not nosedive as much when you actually fire the gun. Second, if they do, then that flat-nosed bullet might not work in that gun. You might need to switch to a round nose profile to get reliable feeding. Might want to increase the crimp a little to remove the bell. The case mouth diameter should not be larger than the neck diameter.
  8. The powder companies don't say why their load data stops well below the SAAMI pressure limit. We're left to guess why. It might mean that adding another 0.1 grains pushes it past the limit, or is compressed (which might affect powder performance), or ..... who knows what. Max velocity within max pressure limits varies with every gunpowder, so using velocity as a measure of pressure is not wise since one can come to the wrong conclusion about pressure, and since pressure is a safety issue, it's the most important variable. See Hodgdon's data for 700-X and the 147 grain XTP as an example. It won't get near the SAAMI nominal velocity without going way over the pressure limit. Your way of thinking about the charge weight/velocity/pressure issue has some validity, but since Hodgdon does not provide pressure curve data for their powders, we simply don't know what happens when you increase the charge weight past their recommended levels. There are simply too many variables that can affect the results - bullet type, OAL, and so on. That's why it's hard for us to speculate to much. Some powders are more-or-less linear in their response to charge weight increases over the range we normally use them. Some powders might behave in a non-linear fashion, and pressure could quickly rise to dangerous levels. We simply don't know if they don't provide that information. You could ask Hodgdon. They might have some good advice for you. Sometimes powder company answers are canned (don't do that!) and sometimes they are very happy to share more detailed information.
  9. it's just different bullets and powders. Cast lead bullets with lube smoke like crazy.
  10. It probably depends on how you make the comparison. The larger caliber will produce less muzzle rise if they push the same bullet weight to the same speed with the same gunpowder using the same compensator design. This is because the larger caliber requires more gunpowder to accomplish this, and more powder means more gas pressure. Since the larger caliber generally uses heavier bullets, the smaller caliber probably feels, and is, more effective in reducing muzzle rise and is less harsh than the larger caliber.
  11. Here is some reading material for you. I might help explain some of your questions: http://www.shootingtimes.com/ballistics/compensators-pressure-gas/ http://www.shootingtimes.com/reloading/power-factor-recoil-bullet-weight-compensators/ https://books.google.com/books?id=YVOYCAAAQBAJ&pg=PA238&lpg=PA238&dq=gunpowder+and+recoil+brad+miller&source=bl&ots=PvyOUvAeIV&sig=0ZzSPtqkQHrqZjtQjQO7t0HvOsU&hl=en&sa=X&ved=0ahUKEwiRseDbw8XTAhXKz1QKHSMpC8YQ6AEIOTAD#v=onepage&q=gunpowder and recoil brad miller&f=false Also, forget about chamber pressure. It does not predict gas pressure at the muzzle/compensator.
  12. I found all kinds of data for SP2. http://www.vectan.fr/UK/
  13. 3N38 works in the 9mm with 115 grain bullets. It might be faster or slower than A#7 depending on which burn rate chart you look at.
  14. That doesn't mean it doesn't work at less than 174 PF. It only means that it works better with your load at that PF. Comps work at all PFs because they divert gas at all PFs. Unless the comp has valves that only allow gas to vent at some magical PF.
  15. Your comp doesn't work at all until PF gets over 174? That doesn't sound possible.