Rusty Luck
Member
I have my .270 sighted in at 100 yards, how should I aim when shooting say 50 yards, 75 yards, or even 25? Thanks
Question about shooting a scoped rifle
- Thread starter Rusty Luck
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1st of all what are you shooting at?
If you are sighted in at 100 yards with a .270 just aim POA. Even @ 200 yards you should only be about 2.3" low is my guess, but you can find ballistic charts at Winchesters website or at other places on the net.
If I were you I would sight in @ 200 yards, and be good out to any reasonable hunting range.
I sight in my .25-06 (similar to your .270) at 1.5" high at 100 yards. I can aim dead on out to 300 yards, and still be in the kill zone. Most of my shots are 100 yards or less, but there are time when I shoot across fields at deer, pigs, yotes or or targets.
With you being sighted dead on at 100 yards. Just aim true, and what ever you shoot at will die if you hit true.
Even with my .25-06 sightes 1.5" high @ 100 yards. If a deer is @ 50 yards. I am aiming high shoulder or at the shoulder. I wouldn't try to compensate at all if I were you. Hold true and squeeze. Your bullet will create a massive wound channel, and destroy 4" to 6" internally, and most likely exit with a large hole on the other side.
Is this your first "high powered" rifle?
If you are sighted in at 100 yards with a .270 just aim POA. Even @ 200 yards you should only be about 2.3" low is my guess, but you can find ballistic charts at Winchesters website or at other places on the net.
If I were you I would sight in @ 200 yards, and be good out to any reasonable hunting range.
I sight in my .25-06 (similar to your .270) at 1.5" high at 100 yards. I can aim dead on out to 300 yards, and still be in the kill zone. Most of my shots are 100 yards or less, but there are time when I shoot across fields at deer, pigs, yotes or or targets.
With you being sighted dead on at 100 yards. Just aim true, and what ever you shoot at will die if you hit true.
Even with my .25-06 sightes 1.5" high @ 100 yards. If a deer is @ 50 yards. I am aiming high shoulder or at the shoulder. I wouldn't try to compensate at all if I were you. Hold true and squeeze. Your bullet will create a massive wound channel, and destroy 4" to 6" internally, and most likely exit with a large hole on the other side.
Is this your first "high powered" rifle?
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Kendal Black
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Just hold dead on. For practical purposes the .270 shoots in a straight line out to 100 yards. An interesting number to look at is the midrange rise, that is, the maximum height the bullet reaches in its flight. At 50 yards (actually a smidgen more) the bullet reaches this maximum height, a trivial amount in this case.
At 25 or even at 50 the bullet will appear to strike a little bit low, but that is simply because the line of sight is above the barrel's axis.
Here is a graph: http://www.federalpremium.com/products/details/rifle.aspx?id=237 Click on "Average Range."
Kendal Black said:
I wish the trajectory charts didn't show the bullets rising, as if they defy gravity. Bullets do nothing but drop to earth after they leave the barrel, and never rise to above bore axis. They could show the chart with the arch going in a downward dirrection, and still put in the drop graph over the distance of bullet travel. I guess they figure we all aim up, or shoot on level ground with the target exactly at bore height. I always seem to shoot downhill.
vedearduff
Member
You are correct, the bullet does not rise above the bore axis.
Actually, the graphs are also accurate. When you sight in your rifle, you are setting your sights so that the axis of the bore is aligned above the target.
Lets ignore the curvature of the earth and assume a perfectly level surface. If the axis of the bore were parallel with this surface, the bullet would never rise above the the line of sight.
To compensate for this, the sights are aligned such that the axis is not, in fact, parallel with the surface. Using the information from the link above; the bullet will be about half an inch above the line of sight at 50 yards and just under one and a half inches high at 100 yards. This is for a 200 yard zero.
The trajectory charts are an accurate representation of the path the bullet takes.
I hope this helps.
Vernon
Actually, the graphs are also accurate. When you sight in your rifle, you are setting your sights so that the axis of the bore is aligned above the target.
Lets ignore the curvature of the earth and assume a perfectly level surface. If the axis of the bore were parallel with this surface, the bullet would never rise above the the line of sight.
To compensate for this, the sights are aligned such that the axis is not, in fact, parallel with the surface. Using the information from the link above; the bullet will be about half an inch above the line of sight at 50 yards and just under one and a half inches high at 100 yards. This is for a 200 yard zero.
The trajectory charts are an accurate representation of the path the bullet takes.
I hope this helps.
Vernon
MachIVshooter
Member
That's going to depend on several factors, namely zero range; Using a 150 grainer with a B.C. of ~.450 leaving the muzzle at 2,900 FPS:
With a 100 yard zero, max rise above POA is 0.1" at 85 yards
With a 200 yard zero, max rise above POA is 1.7" at 120 yards
With a 300 yard zero, max rise above POA is 5.1" at 165 yards
http://www.jbmballistics.com/
Rusty Luck
Member
Thanks for the insight guys, yes its my first "high powered" rifle, and I have done really well with it thus far, just curious if there was anything I should worry about with shorter distances.
rcmodel
Member in memoriam
Only thing is, at really shorter distance, like killing a snake 3 feet from you?
You have to aim 1 1/2" high as the barrel is 1 1/2" or so lower then the cross-hairs.
At longer range of 100+ yards or more, the bullet crosses the line of sight twice in a parabolic curve.
Once going up, and again coming down.
But for your .270 sighted in at 100 yards.
Anything between the muzzle and the 100 yard target is all going uphill from the bore line to the sight line.
A typical .270 load sighted in at 100 yards:
Muzzle = 1 1/2" low
25 yards = 3/4" low.
50 yards = 1/2" low.
75 yards = 0.
100 yards = 0.
rc
You have to aim 1 1/2" high as the barrel is 1 1/2" or so lower then the cross-hairs.
At longer range of 100+ yards or more, the bullet crosses the line of sight twice in a parabolic curve.
Once going up, and again coming down.
But for your .270 sighted in at 100 yards.
Anything between the muzzle and the 100 yard target is all going uphill from the bore line to the sight line.
A typical .270 load sighted in at 100 yards:
Muzzle = 1 1/2" low
25 yards = 3/4" low.
50 yards = 1/2" low.
75 yards = 0.
100 yards = 0.
rc
Art Eatman
Moderator In Memoriam
If deer hunting or coyote hunting is the deal, I recommend sighting in for about two inches high at 100. That's about dead-on at 200 and five or six inches low at 300. IOW, just point it and pull. You don't really have to think. If you center the crosshairs on the heart, you might hit a smidgen high in the heart at 100 yards; but certainly in the heart/lungs--and that tends to put paid to a critter.
rcmodel
Member in memoriam
I totally agree.
Sighting in a .270 for a 100 yrd zero is like putting a 55 MPH speed limiter on a new Ferrari!
Here is a real good thread discussing the benefit of sighting in for MPBR or Maximum Point Blank Range for the caliber in question.
http://www.thehighroad.org/showthread.php?t=623632&highlight=maximum+point+blank+range
2.0" high at 100 yards will put you zeroed at 200 and give you a MPBR of about 275 yards.
In other words, you put the cross hairs on something between you and 300 yards you are going to hit it.
rc
Sighting in a .270 for a 100 yrd zero is like putting a 55 MPH speed limiter on a new Ferrari!
Here is a real good thread discussing the benefit of sighting in for MPBR or Maximum Point Blank Range for the caliber in question.
http://www.thehighroad.org/showthread.php?t=623632&highlight=maximum+point+blank+range
2.0" high at 100 yards will put you zeroed at 200 and give you a MPBR of about 275 yards.
In other words, you put the cross hairs on something between you and 300 yards you are going to hit it.
rc
I'm going to approach this from a different angle.
True enough, but you can still do the same thing with a 100 yard zero. Zero at 200 yards and you are 5.7" low at 300. Zero at 100 and you are 9.3" low at 300. (according to the Hornady ballistics program). Either way you are good for a 300 yard shot on a typical deer with no hold over.
The reason I prefer a 100 yard zero is because you will never be more than 1" above or below your line of sight between about 25 yards out to around 150 yards. The ranges where virtually all shooting happens even in the Western states. A deer and most other game is large enough that 4-5" either way usually does not matter, but often you only see a small portion of the animal because of trees, brush between you and the animal and must hit a much smaller target. I'll gladly give up that 3.6" at 300 yards and not have to figure out how much to aim low at the closer ranges where we are all most likely to actually shoot.
True enough, but you can still do the same thing with a 100 yard zero. Zero at 200 yards and you are 5.7" low at 300. Zero at 100 and you are 9.3" low at 300. (according to the Hornady ballistics program). Either way you are good for a 300 yard shot on a typical deer with no hold over.
The reason I prefer a 100 yard zero is because you will never be more than 1" above or below your line of sight between about 25 yards out to around 150 yards. The ranges where virtually all shooting happens even in the Western states. A deer and most other game is large enough that 4-5" either way usually does not matter, but often you only see a small portion of the animal because of trees, brush between you and the animal and must hit a much smaller target. I'll gladly give up that 3.6" at 300 yards and not have to figure out how much to aim low at the closer ranges where we are all most likely to actually shoot.
doubleh
Member
Trajectory tables will get you close. The only way to be sure where YOUR rifle hits at different distances is to shoot it at those distances.
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