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  1. Lindy

    Range Report Barrometric pressure

    Re: Barrometric pressure Here are some things you might like to know about shooting and barometric pressure: Barometric Pressure and Ballistic Software Making Ballistic Cards Using Density Altitude Manual Calculation of Density Altitude I don't get on here very often - if you...
  2. Lindy

    Range Report Ballistic FTE G1 vs. G7

    Re: Ballistic FTE G1 vs. G7 The theoretical advantage of G7 is that it provides a superior calculation of velocity downrange. This may be an advantage with respect to knowing when the bullet is approaching the transonic region - but that may not be much of an advantage to a working sniper...
  3. Lindy

    Range Report Balistic Cards don't match DOPE at Long Range

    Re: Balistic Cards don't match DOPE at Long Range You might find this a useful explanation of some reasons why the program output does not match your field results: Sources of Inaccuracies in Ballistic Programs
  4. Lindy

    Advanced Marksmanship More accurate Barrett 82a1 or tac 50?

    Re: More accurate Barrett 82a1 or tac 50? Just for the record, I have absolutely no doubt that the Tac50 is inherently more accurate than the Barrett semis. But it takes a lot more skill to drive a heavy-recoiling semi accurately than it does a bolt gun of the same caliber. The Barretts are...
  5. Lindy

    Advanced Marksmanship More accurate Barrett 82a1 or tac 50?

    Re: More accurate Barrett 82a1 or tac 50? <div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Expect to get 2.5moa accuracy AT VERY BEST.</div></div> Interesting. The first time I ever shot an M82A1, I shot a 1 MOA 5-round group at 690 yards, using Mk...
  6. Lindy

    Sidearms & Scatterguns Just another 1911 picture.

    Re: Just another 1911 picture. That's a really beautiful work of art! My Glock is cringing...
  7. Lindy

    Range Report RPM Of A Bullet In Flight

    Re: RPM Of A Bullet In Flight Umm, how about hundreds of thousands? Assume that the bullet at the muzzle is going 2600 feet per second in a barrel with a twist that is 1 turn per foot (1 turn in 12 inches.) The math, then, is pretty simple. 2600 revolutions per second X 60 seconds per minute...
  8. Lindy

    Spotting without reticle-based spotting scope

    Re: Spotting without reticle-based spotting scope There are a couple of ways. Probably the easiest is to base your spot on the target dimensions, either the width or the height. "Adjust your point of aim half the width of the target to the right," say, or "Come up one-quarter of the height of...
  9. Lindy

    Range Report Temp affect on velocity

    Re: Temp affect on velocity If you haven't read it, this may be a useful link: Sources of Ballistic Program Inaccuracies
  10. Lindy

    Range Report Temp affect on velocity

    Re: Temp affect on velocity The only way to really know is to how much temperature affects muzzle velocity is to chronograph the load in your rifle at different temperatures. However, when I have no data on a load, the figure I assume is 1 foot per second per degree F. That's about what a...
  11. Lindy

    Angle Shooting Gear

    Re: Angle Shooting Gear You can also do that calculation much faster with a Mildot Master than a calculator.
  12. Lindy

    Range Report 100y vs: 200y zero....

    Re: 100y vs: 200y zero.... The advantage of using a 100 yard zero v. 200 is that everything is "up". With a common .308 load, and a scope with 5 mils of marks below the horizontal axis, one can simply hold high using the reticle out to 600 yards. In my experience, beyond that range one often...
  13. Lindy

    Range Report 100y vs: 200y zero....

    Re: 100y vs: 200y zero.... Umm, no. Both 100 yards and 200 yards are too short a distance for the weather to have any effect on the zero, with the <span style="font-style: italic">possible</span> exception of extremes in temperature, which has an effect on muzzle velocity rather than air...
  14. Lindy

    Angle Shooting Gear

    Re: Angle Shooting Gear At longer distances, multiplying the actual range to the target by the cosine of the angle may not be sufficiently accurate. A better method is to multiply the dope for the actual distance by the cosine. See: Inclined Fire Explained - Sierra External Ballistics.
  15. Lindy

    Advanced Marksmanship High angle/ is this right? FRANK you been there

    Re: High angle/ is this right? FRANK you been there If it is a rhetorical question, that's fine. But its analog, that of a shot straight down, is not a mere possibility. It has, in at least one case, been made on a real target. Furthermore, it's a shot which requires computation. There is, in...
  16. Lindy

    Rifle Scopes Reticle Conundrum

    Re: Reticle Conundrum A BDC reticle is useful in a very limited scope of loads and distance - at longer distances one will have to compensate for atmospheric conditions. I don't find either BDC reticles or knobs useful. More useful for me is a universal graduated reticle which can be used...
  17. Lindy

    Help me Choose please.

    Re: Help me Choose please. If you buy any AI in a caliber, you'll never need another rifle in that caliber. My second precision rifle was an AI AE in 7.62X51, in 2003. I've never seen any reason to buy another in that caliber.
  18. Lindy

    1099K for using PayPal?

    Re: 1099K for using PayPal? Read this: https://cms.paypal.com/us/cgi-bin/market...ing_us/IRS6050W
  19. Lindy

    Looking for my first rifle

    Re: Looking for my first rifle Graham: It could be worse. He could come down to Rifles Only, and use Jacob's AW for the course. Then he'd have to go buy an AW, and he'd be out 7 grand. And he wouldn't own a scope...
  20. Lindy

    Advanced Marksmanship High angle/ is this right? FRANK you been there

    Re: High angle/ is this right? FRANK you been there Actually, it is more accurate to take the dope for the actual distance - in your example, 400 meters - and multiply the dope by the cosine of the angle. To understand why, read this link: Inclined Fire Explained In addition, there is a...
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