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This may be the wrong forum for this, and if so, please move it. I'm trying to figure point of aim for my 9.3, and other rifles. I'll be using a Chrono of course. I'm wondering if there is a simple formula for rough estimates. I'm sure that an exact measurement would require an infinite number of variables (e.g. spin rate, barrel length spin of earth, 9.3m per sec, per sec, humidity, seal level etc, etc). If any of you physics/math guys can lend a dumb law school student and liberal arts major a hand, I'd be much obliged. "Sometimes nothing can be a pretty cool hand." 470 Heym; 9.3x74r Chapuis, Heym 450/400 on it's way | ||
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madden Use the "Simplified Trajectory" program. So simple even a liberal arts major can do it. http://www.eskimo.com/~jbm/bal...asic/traj_basic.html ray Arizona Mountains | |||
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The link cheechako posted is very good. If you can it is always best to actually zero at your desired distanc ean then actual see where you hit at 100, 200, and 300 yards... Mike Never under estimate the internet community to use any opportunity to reply to a post with their personal rant about their tangentially related, single occurrence problem.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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Eskimo is the way to go! Love shooting precision and long range. Big bores too! Recent college grad, started a company called MK Machining where I'm developing a bullpup rifle chassis system.  | |||
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Thanks a bunch fellas. Wow, that's a cool website. Should of stuck with derivative and multi-variable calculus... Roman and Greek history was easier and I didn't have to go to class on Fridays. "Sometimes nothing can be a pretty cool hand." 470 Heym; 9.3x74r Chapuis, Heym 450/400 on it's way | |||
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Just look at 35 Whelen Ballistics, fwiw!! NRA Benefactor Life Member | |||
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Simplest way: Oh, so that kudu I just missed was actually 275 yards away, and not 200? There is hope, even when your brain tells you there isn’t. – John Green, author | |||
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More like, "Oh, so the pig I just missed was at 75 yards and not 50?"  "Sometimes nothing can be a pretty cool hand." 470 Heym; 9.3x74r Chapuis, Heym 450/400 on it's way | |||
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The previous reference is good. If you want a graphically oriented interface try: http://www.norma.cc/default.asp?Lang=2# then click "ballistics." Is also a nice program. If you're really interested in things less than 100 yards, set the sight-in at 100 and don't sweat it much. Mike -------------- DRSS, Womper's Club, NRA Life Member/Charter Member NRA Golden Eagles ... Knifemaker, http://www.mstarling.com | |||
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Everything falls to the ground at 9.8 m/s/s. Drop is a factor or how fast it gets to the target range and how much vertical velocity it has. Unfortunately, I've forgotten 90% of the Calculus I have ever learned, but if you're good with it, it makes easy work for figuring out the drop at any given range. The rest of us dummies go and shoot at varying ranges, which turns out to be more accurate than the math in the end. John | |||
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Couldn't agree more. I know everything drops at 9.8 meters per sec per sec (made it through Newton, but started getting dizzy at Einstein and Bohr), but I can still remember being fascinated as a kid by the fact that a bullet drops at the same speed it does as if it were just dropped out of one's hands. The reason I was curious about said physics is bc my gun range ends at 100 yds... not that I shoot a whole lot past that at anything other than vermin. "Sometimes nothing can be a pretty cool hand." 470 Heym; 9.3x74r Chapuis, Heym 450/400 on it's way | |||
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My 9,3x62 w/ 286 NPT is: 0.7" high @ 50 1.3" high @ 100 0.0" @ 150 yards 3.3" low @ 200 9.0" low @ 250 ________ Ray | |||
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Thats great thanks. Whats your velocity? "Sometimes nothing can be a pretty cool hand." 470 Heym; 9.3x74r Chapuis, Heym 450/400 on it's way | |||
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If you know the BC of the bullet, and the speed of the bullet at the bore, you can look it up in the back of most reloading manuals. | |||
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Another couple of good sites. http://www.biggameinfo.com/BalCalc.aspx http://www.modernballistics.com/download.htm DuggaBoye-O NRA-Life Whittington-Life TSRA-Life DRSS DSC HSC SCI | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Medium Bore Rifles physics/math for figuring drop of 9.3
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