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  1. J

    Projectile Identification

    Re: Projectile Identification My guess would be a 50 BMG steel core.
  2. J

    Range Report JBM website down?

    Re: JBM website down? It's up for me -- I didn't do anything today. Brad
  3. J

    Securing press to table without drilling

    Re: Securing press to table without drilling I used a 2x6 for many years. I bolted the press to one end and laid it across the table. Just clamp at both ends and it will be very steady. the leverage of the 2x6 across the table is substantial -- it won't move. I never had good luck just...
  4. J

    Rifle Scopes Think this could be my scope?

    Re: Think this could be my scope? Your Elevation angle looks a little large, but not necessarily unreasonable. The moa required for 300 yards also seems excessive. Velocity also looks reasonable. How are you measuring the MOA? What scope are you using (did I miss it in your post)...
  5. J

    Rifle Scopes Think this could be my scope?

    Re: Think this could be my scope? It's very hard to diagnose potential problems when looking at the output. Do you have "Elevation correction for zero range checked"? What did you use as inputs? If you still have a problem, use the report bug button on the output; or post the inputs...
  6. J

    what does 338 LM end up costing if you handload

    Re: what does 338 LM end up costing if you handload I don't know if it's a handloading cost or not, I include it when people ask me what it costs to pull the trigger. as for barrel wear, it's the powder. The last barrel I replaced (Pac-Nor -- which I liked very much) was severely eroded for...
  7. J

    what does 338 LM end up costing if you handload

    Re: what does 338 LM end up costing if you handload One other cost of shooting a big .338 is barrel wear. I have a .338-416 and it costs me about ~$400 to replace the barrel (I do it myself and am including shipping). I only get about 1200 rounds of accurate life out of a barrel (at least...
  8. J

    Range Report Somebody check my math...

    Re: Somebody check my math... Looks right to me.
  9. J

    so you want to shoot 308 to a mile?

    Re: so you want to shoot 308 to a mile? 1) Those aren't Matchkings (MatchKings don't have a cannelure) 2) They probably went through a target at much closer range and bounced downrange. 3) I've shot 175s much farther than 900 yards. This proves nothing. Brad
  10. J

    AR 10 VS M1A EBR

    Re: AR 10 VS M1A EBR I have had both and switched to the AR-10(T) (sold my M1A) 1) My AR-10(T) is more accurate than the M1A, but it's probably not fair to compare a 10(T) with a standard M1A. 2) Scope mounts being included made it much easier/cheaper to mount. 3) My op rod broke on my...
  11. J

    Cosine Indicator on 20 MOA base

    Re: Cosine Indicator on 20 MOA base Keep in mind that for the way my calculators give you answers (I am not speaking for other software out there), you want the angle measured with respect to the line of sight -- so you want the angle indicator mounted parallel to the scope, not the barrel. Brad
  12. J

    Range Report Making Ballistic Cards Using Density Altitude

    Re: Making Ballistic Cards Using Density Altitude <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SRSDriver</div><div class="ubbcode-body">I wanted to clarify one thing... If I'm using the JBM card/ucard, the elevations I'm inputting are density altitudes...
  13. J

    Range Report Elevation Adjustment Formula Question

    Re: Elevation Adjustment Formula Question <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bbpl</div><div class="ubbcode-body"> yes i know air resistance is a major factor, but what im asking for is the basic bullet drop formula. The parabolic equation of the...
  14. J

    Range Report All of our Ballistics Programs are now outdated?

    Re: All of our Ballistics Programs are now outdated? My guess is that he found a closed form solution for a standard drag model (e.g. Drag ~ V^2) that Newton was looking for. I don't think it will change much because bullet drag is not an analytical function and can't be integrated easily --...
  15. J

    Range Report Which Ballistic Calculator Is Correct ??

    Re: Which Ballistic Calculator Is Correct ?? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: damoncali</div><div class="ubbcode-body">In case anyone is wondering, modern ballistic calculators (of which JBM is one) all do use the same math, which is derived from...
  16. J

    Gunsmithing 300 BLK Question

    Re: 300 BLK Question Are you running it suppressed with the subsonic rounds? If not, you probably don't have enough pressure to cycle. That's what mine does -- without a suppressor, it short cycles -- you need the back pressure.
  17. J

    Gunsmithing .308 norma mag

    Re: .308 norma mag <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: johnnynova</div><div class="ubbcode-body">So a long action 700 will work that's good! Where is a good place to find them? Found a place in manitoba that sells the AX and they want to know what...
  18. J

    Gunsmithing .308 norma mag

    Re: .308 norma mag I have a 308 Norma Mag in a long 700 Action. Works just fine. Brad
  19. J

    Resizing Belted Magnum Brass

    Re: Resizing Belted Magnum Brass I have always used the L. E. Wilson full length resizing hand die for this. It works very well -- unfortunately, they don't make them anymore. You can find them on ebay occasionally. Brad
  20. J

    Gunsmithing ? on what lapping compound for AR upper reciever

    Re: ? on what lapping compound for AR upper reciever I never said you didn't have a problem, but if the barrel is off that much, you should be able to see it. Of course, since the rifle is OK with other scopes, I would look at the scope itself and the mounts. I can't imagine how much metal...
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