SLAMFIRE just cannot happen. if you sight your .270 dead on 100 yards everthing after that is down hill. even at a 100yards zero your bullet cross hairs between 70 and 80 yards. there is no load that i know of that can hold that line if zeroed at 100 yards. even a 22-250 with a 45 grain if zeroed at 100 yards will never be high after the 100yard mark. you are forgetting one thing GRAVITY. just cannot happen.

oh it can happen. Not with a 22-250 or 270 or any other caliber.

If you could shoot a projectile at 8,000 FPS and could negate wind effect, it would never hit the ground. The bullet would fall at the same rate as the Earth's curvature.

The best way (that I am aware of) to sight in a rifle, first is to figure out how far you can expect to kill anything that you'd be willing to shoot at. If you won't shoot over 200 that fine, or if not over 400, that's fine too.

But you have GOT to know a very close approximation of the trajectory of your projectile, and you have GOT to know how far away your target is.

If you're willing to shoot at something 400 yards away (this is an example), sight it in at 400 yards. How do I do that? Sight it in at 100 for however good of a group I can get (5 shots, good cleaning after a 5 shot group, one minute apart in shots), then step back to 200 yard shots, adjusting only the top knob on the scope (not windage) till you're in a tight pattern at what you're shooting at. Then 300...same process. Then 400...same process.

When you're done at whatever range you're comfortable to shoot at something, put a target at 50, 100, 150, 200, 250, 300, and 350. Hold right on the target and see where the bullet goes. How much off at 50? at 200? With a flat shooting .270, you won't be much, if any out of a +/- 4" line off the aimed at target, above or below, at any point in the trajectory of the bullet.

Thus this is the tradeoff. Sight your gun in for 200 yards (dead on) and anything less than that you don't think about bullet trajectory. You put the crosshairs where you want and end it. BUT, you take a major risk shooting much farther than that. 300 is still a safe range, bullet is (from a handy ballistics chart) about -6.5 from the target on a 200 yard zero. That's pushing it, in my mind.

If you sight in your gun for a farther distance (which is up to each shooter, in my mind) then you need to know where your bullet is (vertically) on it's trajectory at points between you and the zero distance.

RAZORMATT YOU ARE MISSING THE POINT. we are talking about 100yard zero. you are talking about changing your point of aim. by adjusting you scope. if you are zeroed at 300 yards yes the bullet has not peaked yet at 100 yards. the main words here are 100 YARD ZERO. about the 8000 feet per second stuff with guns you lost me. but i do agree with the 200 yard zero being the best. except for a few of the slower calibers.

Check this website out!! This guy knows his rifle stuff. His method will get the most out of the bullet you are firing. [link]http://www.chuckhawks.com/rifle_trajectory_table.htm[/link]

You have assumed that the bullet was already decending in relation to the line of sight at 100 yards, In other words crossing zero for the second time. His midrange groups show that did not happen, his bullet is crossing zero for the FIRST time at 100 yards. It started out some 3" inches low and got to the line of sight at 100 yards so it is still climbing at that point. I don't know where it will peak or how high it will be when it does, nor do I know at what range it will cross zero again.

green01: if the earth had no atmosphere and had the same gravitational acceleration, a projectile would never hit the ground if it were fired horizontally (parallel to the ground) at 8,000 FPS. It would literally be like a satellite at 4'. (trees and mountains not included in this example!)

Slamfire: Must be a really odd scope/gun configuration....but I have hard time believing a bullet traveling 100 yards and hitting dead on in that distance when on the "up" of it's trajectory.

But this is an interesting problem.

I guess to figure out what was really going on, I'd go to a VERY FLAT PLACE where I could put transparencies out at like ever 25 yards to cover 200 yards or so. I'd color code them with like a 1" circle (not darkened), vice my gun, and through the scope work to line-up those circles in the transparencies.

They'd have to be just 8X11 pieces, but it would be important to make sure the aiming point was the same in each.

slamfire i have assumed knowthing. these numbers i am passing on to you have been in the books for years. if you have a gun sighted in dead at 100 yards and it is still climbing it is a million dollar gun and you have the only one in the world.

Green01:

No reason to question the guys inability to read a chart.

One possible problem here would be a VERY high scope mount that is very poorly sighted in (aiming VERY high).
Hell, I don't know what the problem is, but I know I could fix it.



But I would agree for one thing: if you've got a gun that's on the way "up" and hits your "sighted on" target at 100 yards, it's worth a frickin' lot of money and the only one around.

I don't know about this bullet rising thing. Yes, it is getting higher off the ground, but that is because the tangent the rifle was fired is "Upward".

No bullet rises after leaving the barrel.

All bullets immediately start falling to the ground at the force and speed of gravity the instant they leave the barrel.

razomatt i will agree. i will edit.[&o]