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Guy Neill

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Everything posted by Guy Neill

  1. 5-pound gun 124gr = 1.66 ft-lbs 147gr = 1.37 ft-lbs
  2. That gives recoil energies of (still assuming a 36-ounce gun)' 124gr - 3.68 147gr - 3.04
  3. sorry, I was using post one values.
  4. Leet's look at your numbers; Gun weight - not given, but assuming 36 ounces. Powder weight - unknown - using zero bullet weight - 115gr bullet velocity - 1145 fps recoil energy = 2.46 ft-lbs Similarly, 124gr recoil = 2.04 ft-lbs 147gr recoil = 2.58 ft-lbs
  5. Yes - if the powder charge weights vary, it will vary the recoil energy.
  6. Since calculating recoil energy starts with a momentum balance to determine the gun velocity - as I recall, equal power factor will equal recoil energy. Power factor is a momentum value, but with odd units. The powder gases are part of the ejecta and play a part in the momentum. Once the gun velocity is known, putting it in the kinetic energy formula gives the recoil energy. As stated above, many like the heavier, slower bullets for spreading the recoil energy over a longer period of time. Also, as stated, many prefer the sharper (quicker) recoil energy of a lighter, faster bullet. Even though the actual recoil energy is the same.
  7. Yes - first question is if they both used the same bullet. If not, the bullet is a prime part and data for the bullet is generally preferred. If they are the same bullet, I would start at the lowest load and work up in 0.3gr increments, looking at chrono data, and looking at the accuracy, then make my determination from the results from your gun.
  8. Comparing Hodgdon data between 231 and 244, they did not show the velocity increase I obtained, but 244 generally did show higher velocities than 231. I've not seen any accray results published. In my testing I was looking at the velocities and did not delve into accuracy. Acccuracy is highly dependent on the gun (and te shooter) but I expect 244 to be capable. It's a matter of seeing what each does in your gun.
  9. It does not look as if I tested 244 in the 40, but in 9mm it gave about 40% more velocity compared to equivalent 231 charges,
  10. Without referring to my notes at the moment, my recollection is that 244 charges weights are comparable to 231, but velocities are higher.
  11. You may also note that for a semi-auto it may offer better reliability to always full length size.
  12. Neck sizing dies typically do not size the case body, or only minimally. For cases coming from a known gun (chamber) neck sizing can work well. For cases of unknown origin, it's likely better to full length size.
  13. You might talk with Springfield Armory as a first step
  14. Your description suggests you are skipping the sizing die after decapping. Use the sizing die after decapping and see if there is a difference. You might double check the bullet diameters and maybe measure the expander plug diameter as well. The expander plug should be a bit smaller than the bullet diameter. Check the case mouth diameter before and after crimping.
  15. I expect machining everything into the barrel is more complex than mounting a thread-on comp.
  16. Michael Plaxco - Obituary & Service Details (rollerfuneralhomes.com) for anyone wanting to sign the guestook.
  17. Did any fire on a second firing pin strike? If so, it could indicate the primers that failed to fire the first time were not completely seated.
  18. My recollection is that Jerry started using a red dot in 1990. At the 1990 IPSC World Shoot, Dou K won with Jerry B placing second. They were to only shooters using red dots.
  19. Numerous factors can affect chrono results. What is the barrel bore diameter compared to the bullet diameter? It's not unknow for the muzzle flash to start the chronograph, giving low velocity readings. I've not used AA7 recently, so I do not recall what sort of muzzle flash it gives. Still, a baffle to protect thestart screen may be of benefit.
  20. For me, one of the goals in dry fire is to drop the hammer without disturbing the sight picture. Capturing the hammer would not allow that. Note that the firing pin spring wll take a beating and should be replaced frequently. Also, inspect the firing pin stop as it may crack.
  21. Do rounds that fail to go into battery show any signs that the bullet contacted the rifling? Are case lengths consistent? If not there may be some variability in the crimp.
  22. I see quite a few Safariland pouches being used.
  23. In SS if you are moving, you're trloading, so a mag well is beneficial. Since you also specfying new grips, you might look at the Hogue Extreme grips ttat have the grips extended along with a new mainspring housing that is also extended, making a mag well from the three. How are the sights?
  24. Water will not "kill" a primer. It will make it harder to detonate, but a heavy enough blow could be a problem.
  25. The club chronograph should serve until you fel any need to have your own. Selecting a press is a balance between price, quantity oof ammunition to be loaded and the time you are willing to invest.
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