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  1. J

    Gunsmithing New Chinese lathe or old south bend?

    Re: New Chinese lathe or old south bend? I look at it somewhat differently, I guess. To me, my money goes where it gets me the most (I have to, I'm a capitalist). What Grizzly does provides a valuable service. People that wouldn't otherwise be able to afford machines can (I have a...
  2. J

    Gunsmithing Anybody know what class threads?

    Re: Anybody know what class threads? Does this help? It's the instructions for the Phantom QD Flash Hider mount (not sure what mount you have). 308.pdf (installation instructions) It looks like 0.625-24 UNEF-3A -- is that the thread class? I have to admit that I had to look up what...
  3. J

    Range Report Tech info on Bergers new 338 cal 300 grain Hybrid

    Re: Tech info on Bergers new 338 cal 300 grain Hybrid Bryan -- do you have a length for this bullet? Thanks! Brad
  4. J

    Range Report Exclusive JBM user needs another program

    Re: Exclusive JBM user needs another program ...or if you can wait a few months, you can purchase my new product, BallistiComp. It measures the temperature and barometric pressure and calculates the density and trajectory to give bullet drop. I'm still testing and I don't have pricing...
  5. J

    Range Report JBM Calculation HELP

    Re: JBM Calculation HELP What Lindy said is right on. There is more here: http://www.jbmballistics.com/ballistics/topics/dragfunctions.shtml The bottom line is that manufacturers pick a drag function and BC, they go together -- you can't change the drag function without changing the BC...
  6. J

    Range Report Software to print Dope sheet w/MIL adjustments?

    Re: Software to print Dope sheet w/MIL adjustments? Note that I have redone my website. The new address is http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi I would suggest everyone clear their browser cache and please be patient. There will probably be a few link problems... Thanks...
  7. J

    Range Report G1 or G7.. I choose G1

    Re: G1 or G7.. I choose G1, first then got taught. <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: azimutha</div><div class="ubbcode-body">Re: Ballistic. If you only know the G1 BC, make sure that the "Native Drag Model" is left as G1 and then below that, set "Use...
  8. J

    Range Report same BC different weight

    Re: same BC different weight <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lindy</div><div class="ubbcode-body"> By which I assume you mean the drag coefficients. We just need to take up a collection to get you a doppler radar. </div></div> The drag...
  9. J

    Range Report JBM Ballistics & Wind

    Re: JBM Ballistics & Wind <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Parkincense</div><div class="ubbcode-body">I am trying to learn how to shoot F-Class on my own. I want to know how much of a hold off is needed for a 10 mph 90 degree crosswind at 550 yards...
  10. J

    Range Report same BC different weight

    Re: same BC different weight <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lindy</div><div class="ubbcode-body">Programs which are not six degree of freedom ballistic programs, which run on mainframes because PCs mostly haven't got the computing power to run...
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