.40 S&W Reload Question

Muzzleflash88

May 20, 2002 12:52

I have been reloading 180gr flat nose jacketed bullets in .40S&W using Accurate Arms #5 with 6.3 grain.

I cannot find ANYWHERE a listed load for the 165 flat nose for the same powder. I can find 155, 170, and 180. Commercially loaded .40 cal in 165 grain is available, but no load data either.

My best estimate of charge would be 6.8gr for the 165 flat nose jacketed bullet with solid base. If someone has experience with this caliber/load I thank you in advance. The bullets are bulk and I believe they are "West Coast Bullets" in a white carboard box, 165gr.

Thanks,
Muzzleflash88

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  oneshy

  May 20, 2002 15:42

  I have used this powder in this caliber, but don't have my chart with me. I would say use the specs for 170. Since you are loading for a bullet only 5gr lighter, and it is lighter, pressure will not be greater. Your 6.3 charge will probably work with less recoil as long as it is enough to cycle the weapon, assuming it is semi-auto.

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  spclark

  May 21, 2002 07:30

  I've used these bullets with good results, but not with AA5 - my personal preference is for Vihta Vouri N340.
  
  In any case, you should exercise caution in "interpolating" load data between known values for an otherwise unavailable load. Rather than the weight of the projectile being the most important consideration, the actual surface area of contact with the bore & rifling, as well as the projectile diameter & hardness, will influence pressure levels. You can use suggested loads for similarly-profiled 170 grain .40 bullets as a starting point by reducing the charge to the minimum recommended value, then working up by .1 grain increments all the while keeping a close eye on your spent cases for signs of increasing or unsafe pressures.
  
  Be VERY CAUTIOUS if you're shooting these reloads in a Glock or other make that has an area of unsupported case just above the feed ramp. Your choice of propellant has a history of being a contributing factor in case failures with this caliber in weapons having unsupported case chambers.

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  mballai

  May 21, 2002 09:34

  Check the powder company websites: they often list load data.
  
  Three Precious Metals: Gold, silver and lead

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  Muzzleflash88

  May 22, 2002 08:47

  Thanks for the feedback.
  
  1. No data at the manufacturer for the bullet weight.
  2. I'm shooting a Sig that supports the case (thanks for warning).
  3. Gonna switch to Vita if the data is avail for the bullet weight.
  
  I am going to run a small batch of 6.8 gr. and see what happens (I am careful and cautious). Thanks for the advice and tips.
  
  -Muzzleflash88

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