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reload speed decreasing each load

Discussion in 'Shooting Related Threads' started by Dirtyharry357Mag, Jan 9, 2012.

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  1. Dirtyharry357Mag

    Dirtyharry357Mag Member

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    Do you find? That each time you reload the the same shot shell that the speed decreases? (reloaded the same each time) If so, what is the drop in velocity for each time you reload?
     
  2. FlaLagarto

    FlaLagarto Well-Known Member

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    I tried testing this years ago.. and if I remember it was approx 25-30fps
     
  3. Unknown1

    Unknown1 Well-Known Member

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  4. Unknown1

    Unknown1 Well-Known Member

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  5. School Teacher

    School Teacher Well-Known Member

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    My understanding of this issue is that with each firing, the case mouth weakens so that each successive firing generates less pressure and a less efficient powder burn.

    Ed Ward
     
  6. minnship8

    minnship8 Well-Known Member

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    Unknown,
    Great article, thanks for sharing.

    Chip
     
  7. Dirtyharry357Mag

    Dirtyharry357Mag Member

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  8. Kevin Fleming

    Kevin Fleming Active Member

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    Emperically speaking, as long as some of the shot hasn't rolled out the end of the barrel, I can see no difference in breaks between the 1st and nth reload.

    K
     
  9. mag410

    mag410 Active Member

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    My experience is that for 1140-1200fps 1 oz and 1 1/8 oz Trap loads, there is little fall off in muzzle speed as long as a proper wad and a powder on the "fast" side of the spectrum (Red Dot, Clays, 700X) is used. Rarely did muzzle speed decrease more than 20-30fps until the crimp got so soft that it would not stay closed. Temperature from 70-100 degrees. I would expect there to be more variation in cold weather.

    When a powder on the "slow" side is used (800X, Universal Clays, PB) the tail off can be more pronounced. When 800X first came out there were lots of 1 oz & 1 1/8 oz loads in the DuPont manual. I am sure they all worked well in the laboratory, but there were many that did not work well in the real world. Crimp resistance was the problem. Loaded in a once-fired hull and shot in warm weather these loads worked fine, but put the same load in a multi-fired hull and shoot it in cooler weather and they were bad to awful. DuPont subsequently removed most of the 1oz loads. The worst combinations were "hot" primers with tapered wads in straight wall hulls.

    I stick to fast rate powders,(Red Dot or Promo) tapered wads (AA12 or WT12), in tapered hulls (AA or STS), shoot in warm weather, and load them till the split or get soft.

    Michael
     
  10. DecalDude

    DecalDude Active Member

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    Well they old guys at the local clubs told me I was nuts when I said I felt a differance in my 6 time loaded shells and 1 time fired shells. I was sure it had to do wit inside hull erosion of the sides and causeing different pressures.

    Jerry Lewis
     
  11. Ross

    Ross Well-Known Member

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    Cut open a new factory load & try to pull out the wad notice how slick the inside of the hull is now look at a 2-3-4-5 times reloaded, see how rough it is, quite a bit of escape route for the rapidly expanding gases plus probably more drag (friction) also. then try to push open the crimp-- then do the same on the multiple fired hull, and notice the difference. I think that is why reload data uses data for once fired hulls. Also presume there is an allowance (correction factor) included in their data for hulls in good condition. Maybe not enough difference that I could tell but I'm fairly sure there has to be "some". Anyway if in doubt- toss it, hulls are too easy to get to gamble. Ross Puls
     
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