Palm Pilot/PDA ballistic

Discussion in 'Equipment Discussions' started by daveosok, Jul 28, 2004.

  1. daveosok

    daveosok Guest

    What suggestions do you guys have for hand held ballistic programs that work in pda's or palm pilots?
    TID.
    Dave
     
  2. Jeff In TX

    Jeff In TX Well-Known Member

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    Aug 10, 2003
    Dave,

    I have Pesja's ballistic software for my PDA. Very simple and works well. It is a very simple program without bells and whistles.

    Stay away from the Horror, oops Horus ballistic program. That is the worst written program I've found.

    hope it helps
     

  3. Randy in Va

    Randy in Va Well-Known Member

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    Jan 9, 2002
    Jeff, please explain what is wrong with the Horus software and compared to what that did it correctly.

    Thanx
     
  4. kidcoltoutlaw

    kidcoltoutlaw Well-Known Member

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    Dec 18, 2001
    i have perry systems and it works great in my palm m500.
     
  5. Jeff In TX

    Jeff In TX Well-Known Member

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    Aug 10, 2003
    Randy,

    I down loaded the free trail version and started to play with it. They use something called a C1 drag model. This ballistic model is in none of my ballistic books.

    You cannot changed drag models as it only uses a C1 drag model. Therefore the ballistic calculations treat all bullets regardless of type, shape or design the same.

    I took their example ballistic data and ran my own numbers. They are simply using Mayevski Ingalls G1 drag model. The Mayevski Ingalls drag model is based on a 100+ year-old calculation using a 1 inch 1 pound round nose projectile as its basis. So what Horus is really saying…. any type of bullet regardless of shape can be calculated using the same mathematical model.

    So if I have a two different bullets with very close BC’s, say a 600 grain .458 barnes round nose spire point bullet with a published G1 BC of .454 and a 160 grain .284 cal sierra spitzer BT with a published G1 of .455, both leaving the muzzle at 2600 per second they are going to have the same aerodynamic flight characteristics. I think not! That’s not rocket science!

    I’ve run into many shooters who have evaluated the Horus system in some of the tactical competitions I’ve competed in. Bottom line from their perspective, it sucks. Out to 400 yards it works fine, but beyond that it’s a crapshoot and doesn’t work as advertised.

    I’ve been able to use Pejsa’s program to match my actual data on my loads very accurately. You just have to play with the retardation coefficient on his program, which is pretty simple and straightforward.

    Hope it helps
     
  6. Jeff In TX

    Jeff In TX Well-Known Member

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    Aug 10, 2003
    Dave,

    Here's Pejsa's homepage. Like I said for the PDA the software is very simplistic and easy to operate.

    Best of luck.

    Pejsa's Ballistic home page
     
  7. daveosok

    daveosok Guest

    I'm not a big fan of the horro system either and there scopes with all those lines and hash marks seems to me a bit more than whats needed but to each his own and if it works for someone great, I'm just not that interested in it.
    Jeff your pesja software, do you have a link where I can view this and what type of pda do you have and what os system do you have on it?
    Kidcoltoutlaw your perry software same question as above.