User Panel
User Panel
User Panel
|
Posted: 6/3/2001 5:23:31 PM EDT
[#1]
If it's sighted in for 25 METERS, it should be flat out to 300m
|
|
|
|
Posted: 6/3/2001 5:32:21 PM EDT
[#2]
If I recall correctly, when I battle sight zeroed my M16 for the Marine Corps, we often did on reduced size targets at 30m because the round was climbing at 30m and would drop to the same level as it would be at 300m... I'd guess then that the round would actually hit a bit higher at 100m than it would at 25, so if you're zeroed for 100m you might hit a bit low at 25.
|
|
|
|
Posted: 6/3/2001 5:34:22 PM EDT
[#3]
bullet drop on a .223 is, for all intents and purposes, nonexistant at 25 yards, and miniscule at 100... just shoot dead on and the rifle will be "minute of badguy" for farther than most people can shoot without optics.
|
|
|
|
Posted: 6/3/2001 5:34:59 PM EDT
[#4]
It doesn't!
|
|
|
|
Posted: 6/3/2001 5:44:09 PM EDT
[#5]
Dang......I was hoping for the guy who says it actually climbs.
|
|
|
|
Posted: 6/3/2001 5:48:57 PM EDT
[#6]
You are correct, Bryan. Same rise/drop at 25/250, 30/300, etc. The ones we have at work are still rising at 150 yds.(Their apex is probably at the 175 mark)
|
|
|
|
Posted: 6/3/2001 5:50:10 PM EDT
[#7]
Quoted: Dang......I was hoping for the guy who says it actually climbs. Most of the battle sighting methods would result in alittle climb. |
|
|
|
Posted: 6/3/2001 5:55:05 PM EDT
[#8]
Climbs in relation to the sight line... not the barrel line. In reality there is no climb, we just percive it to be there.
|
|
|
|
Posted: 6/3/2001 5:59:41 PM EDT
[#9]
Very good, Garand. You have proven and made public our misconceptions LOL. So much for us Nuke security guys being professional, huh?
|
|
|
|
Posted: 6/3/2001 9:27:53 PM EDT
[#10]
Depends on the load and the barrel length. With a 100 yard zero, your rounds will hit several inches low at 25 yards from your point of aim.
|
|
|
|
Posted: 6/3/2001 10:21:14 PM EDT
[#11]
hey phrigid..nuke security...AR.. you must be a guard out at ANO?
been there a few times doing eddy current. how things going out there? i apologize if i am mistaken. |
|
|
|
Posted: 6/4/2001 12:19:37 AM EDT
[#12]
It has a ballistic arch when exiting the muzzle and traveling downrange. Bullet temporarily over comes the force of gravity, thus pulling away frum the earth(has to do with velocity/aerodynamics/lift). At o to 100 yds. it should be climbing. No physics whiz bang here, just what I got from the reading I've done on ballistics.Always need to learn more, hope I'm not wrong here for once.
|
|
|
|
Posted: 6/4/2001 12:55:02 AM EDT
[#13]
Originally Posted By Garand Shooter: Climbs in relation to the sight line... not the barrel line. In reality there is no climb, we just percive it to be there. Sure there is climb, but it's because the sights aren't on the same plane as the boreline. Assuming the sight plane is level, the barrel will be slightly elevated (muzzle high), so the rounds will exit traveling upwards. The bullet will cross the sight plane going up on it's arc, and cross again on the way down. If the gun is zeroed at 25 yards, the bullet should strike about 1.75" high at 100 yards, but this will vary on a number of factors, such as barrel length, muzzle velocity, bullet shape, bullet construction, and environmental factors. -Troy |
|
|
|
Posted: 6/4/2001 6:02:40 AM EDT
[#14]
So tell me then, when you are zeroed in at 100 yards, where will the bullet strike at a 200 yard target?? In other words, you aim high for a 25 yard target (when sighted in at 100) so where do you sight your 200 yrd. target??
:-] |
|
|
|
Posted: 6/4/2001 7:50:49 AM EDT
[#15]
ok, thanks troy, you gave me what i was looking for. if i shoot about 1.75 inches low at 25 yards i should be about on at 100 yards. I will be going to an outdoor range soon, just not today. thanks for the info
|
|
|
|
Posted: 6/4/2001 8:56:17 AM EDT
[#16]
Originaly posted by phrigid Very good, Garand. You have proven and made public our misconceptions LOL. So much for us Nuke security guys being professional, huh? In fact I have. You may know how to secure the nuke stuff, but I guess a knowledge of ballistics is not required. If you have a barrel perfectly level (in relation to gravity) the bullet will not rise above the bore line. It is the alignment of the sights and the fact that in most situations that the barrel is tilted slightly upwards in order to get the sights alignend with the target that causes the rise. Here is the data for Sierra .222 Remington 63 Gr SP starting at 3100 fps Range Vel Energy TOF Drop 0 3100 1345 0.000 0 25 3013 1270 0.024 -0.10 50 2930 1201 0.049 -0.43 75 2848 1135 0.075 -1.01 100 2769 1073 0.102 -1.87 125 2692 1014 0.129 -3.00 150 2617 0958 0.158 -4.44 175 2544 0906 0.187 -6.19 200 2473 0856 0.217 -8.27 225 2405 0809 0.247 -10.72 250 2338 0765 0.279 -13.53 275 2273 0723 0.312 -16.75 300 2210 0683 0.345 -20.38 325 2148 0646 0.379 -24.46 350 2088 0610 0.415 -29.01 375 2030 0577 0.451 -34.06 400 1974 0545 0.489 -39.63 425 1919 0515 0.527 -45.76 450 1866 0487 0.567 -52.45 475 1814 0460 0.608 -59.82 500 1763 0435 0.65 -67.83 See... NO RISE. Now if you zero at 250, your line of aim is below the flight of the bullet, but your sights are above. So this rise you think you see is coming from the fact that the line of aim and the bullet path cross 2 times, once when the line of aim crosses below the flight path and the second at the point of aim. The bullet will appear to rise between the first cross and the point of aim, but the bullet is in fact dropping, what your are noticing is the widening and closing of the differance between these two lines. That is how you can have a 25M zero good at 250 with some weapons, those 2 ranges are the 2 points where the line of aim and bullet flight path cross. The bullet does not climb, your line of aim just intersects it, drops below it, then intersects again. Edited for clarity. |
|
|
|
Posted: 6/4/2001 9:11:39 AM EDT
[#17]
My ballistic calculator tells me that you should be 1.5" low at 25 yds to be dead on at 100.
That's a sight 2.5" above the bore line and a 55gr at 3200fps. 62gr bullets will hit so close to this that you won't be able to derive the mean impact difference at 25yds from your groups. |
|
|
|
Posted: 6/4/2001 9:56:55 AM EDT
[#18]
Quoted: It has a ballistic arch when exiting the muzzle and traveling downrange. Bullet temporarily over comes the force of gravity, thus pulling away frum the earth(has to do with velocity/aerodynamics/lift). At o to 100 yds. it should be climbing. No physics whiz bang here, just what I got from the reading I've done on ballistics.Always need to learn more, hope I'm not wrong here for once. Tell me, just how the hell does the bullet pull away from the earth? Any retard can tell you that there are no forces pushing a bullet up. The forces acting on a bullet are from behind (your gunpowder's gases), from the top (gravity) ond from the front (wind) and maybe wind from the sides. A bullet needs wings to create something called LIFT. Lift is what helps thing pull away from the earth. The only way your bullet will "pull away from the earth" is if you point it at the sky. Get a frigg'n physics book and stop beleiving everything you hear on the internet. |
|
|
|
Posted: 6/4/2001 10:00:38 AM EDT
[#19]
...to continue, if you are in a perfect vacuum, barrel parallel to ground, the bullet will drop to the ground as fast as if you dropped it by hand. What in the world will cause it to arc up? Nothing! Garand Shooter is correct when he said it "appears" to arc because it crosses your sites twice.
|
|
|
|
Posted: 6/4/2001 11:10:40 AM EDT
[#20]
Quoted: Dang......I was hoping for the guy who says it actually climbs. Like I said, I knew someone would say it. LOL |
|
|
|
Posted: 6/4/2001 11:30:21 AM EDT
[#21]
if you are in a perfect vacuum, barrel parallel to ground, the bullet will drop to the ground as fast as if you dropped it by hand. Exactly right. In a perfect situation (vaccum), gravity will cause any object (whether it is dropped or is travelling horizontal)to fall bact toward earth at exactly the same rate. Nothing will cause it to travel against gravity unless there is a force to do so (ie the barrel is pointed up). As Troy says, there seems to be a "climb" because the sights and the barrel are not on the same level and there is a slight upward pointing of the barrel to make them meet. The bullet does not climb at all....it leaves the barrel traveling slightly upward. |
|
|
|
Posted: 6/5/2001 7:36:00 AM EDT
[#22]
Quoted: It has a ballistic arch when exiting the muzzle and traveling downrange. Bullet temporarily over comes the force of gravity, thus pulling away frum the earth(has to do with velocity/aerodynamics/lift). At o to 100 yds. it should be climbing. No physics whiz bang here, just what I got from the reading I've done on ballistics.Always need to learn more, hope I'm not wrong here for once. Ripmeyer, Here's your guy!!!LOL[rolleyes] BTW, if you could fire a bullet and drop a bullet at the same time, from the same height, in a vacuum, they would both hit the ground at the same time; i.e., the vertical and horizontal velocity vectors are independent of each other. [;)] |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
