22-250 balistics and trajectory
rjco...@ctcweb.net
long time since physics class for me, but I wanted to get an idea of
what my new 22-250 will do. i recently traded into a stainless
remington 700 in 22-250, and I decided it was a good opportunity to
learn how to do some acurate longish range shooting. I reserched some
trajectory tables for a certain type of remington factory ammo, and
found that if i sight the rifle in at 25 yards, it will also be
sighted in at 200 yards due to the curve of the trajectory. Is this
for real? If so, this would be a fantastic advantage for sighting in
the rifle, since I have an indoor range nearby with a max shooting
distance of 25 yards. there would be no wind or outside forces to keep
me fron getting the most out of the round. So, I guess my question
is-- does the bullet really rise slightly after leaving the barrel as
the table suggests? could this method of sighting in really work?
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<rjco...@ctcweb.net> wrote in message
news:gvfd1h$eah$1...@news.albasani.net...
# here's one for the guys with the computer applications: It's been a
# long time since physics class for me, but I wanted to get an idea of
# what my new 22-250 will do. i recently traded into a stainless
# remington 700 in 22-250, and I decided it was a good opportunity to
# learn how to do some acurate longish range shooting. I reserched some
# trajectory tables for a certain type of remington factory ammo, and
# found that if i sight the rifle in at 25 yards, it will also be
# sighted in at 200 yards due to the curve of the trajectory. Is this
# for real? If so, this would be a fantastic advantage for sighting in
# the rifle, since I have an indoor range nearby with a max shooting
# distance of 25 yards. there would be no wind or outside forces to keep
# me fron getting the most out of the round. So, I guess my question
# is-- does the bullet really rise slightly after leaving the barrel as
# the table suggests? could this method of sighting in really work?
#
There should be plenty of programs on the internet for you to look up and
run. Maybe even some balistic tables.
If any normal gun barrel is level with the ground (assuming a flat ground)
the bullet starts to drop as soon as it leaves the barrel. To hit a target
at much distance you must point the barrel up. The bullet will cross the
line of sight at some distance depending on the height of the sights and
velocity of the bullet and a few other things. This is around 25 yards,
usually not exectally. The bullet will go up and then at some point start
down again. It will cross the line of sight again at the target distance.
You can start by sighting in at 25 yards, but if you are off even a small
ammount you can be several feet off at 200 yards. It is difficult to hold
the point of aim to exectally what the calculations are.
Wayne
# long time since physics class for me, but I wanted to get an idea of
# what my new 22-250 will do. i recently traded into a stainless
# remington 700 in 22-250, and I decided it was a good opportunity to
# learn how to do some acurate longish range shooting. I reserched some
# trajectory tables for a certain type of remington factory ammo, and
# found that if i sight the rifle in at 25 yards, it will also be
# sighted in at 200 yards due to the curve of the trajectory. Is this
# for real? If so, this would be a fantastic advantage for sighting in
# the rifle, since I have an indoor range nearby with a max shooting
# distance of 25 yards. there would be no wind or outside forces to keep
# me fron getting the most out of the round. So, I guess my question
# is-- does the bullet really rise slightly after leaving the barrel as
# the table suggests? could this method of sighting in really work?
#
#
I sent an excel spreadsheet by email showing some curves. The email didn't
bounce, so let me know if you didn't get it.
--Wayne
T.Alan Kraus
> ...
Bullet rising would be magic! What happens is that the line of sight
through scope mounted about 1.5" over the bore intersect the bore line
at 25 yards or so. Then the bullet dropping eventually crosses the line
of sight somewhere down range. Sighting in is the technique of knowing
where that somewhere is.
cheers
T.Alan
Bob Holtzman
# does the bullet really rise slightly after leaving the barrel as
# the table suggests? could this method of sighting in really work?
The bullet never rises above the center line of the bore. The key is
that the barrel is pointed slightly up.
Sighting in at 25 yds will only give you an approximate zero at some
longer range as a barely noticeable error at 25 yds will be magnified
greatly at 200(?).
--
Bob Holtzman
AF9D 8760 0CFA F95A 6C77 E125 BF90 580F 8D54 9279
"If you think you're getting free lunch,
check the price of the beer"
Dennis Mickey
not allow a center fire rifle to be shot at its indoor range did they? Even
if they do, be sure to wear hearing protection. Plugs and headphone style
protection should be used!
rjco...@ctcweb.net
> ...
thanks for all the info--that was very helpful.
Larry The Snake Guy
of your scope above the centerline of the barrel. A 0.1 in error here
will be significant if you try to extrapolate from 25 to 200.
sta...@prolynx.com
# Also note that those sighting calculations depend on the exact height
# of your scope above the centerline of the barrel. A 0.1 in error here
# will be significant if you try to extrapolate from 25 to 200.
#
Yeah, lots of variables like that with that sort of extrapolation.
Altitude makes a difference, air pressure makes a difference, humidity
makes a difference, all that stuff those computer models tend to
ignore or plug in STP. You can get away with with it with military
arms becuase they're all identical and shoot the same ammo. With
civilian stuff, you're better off doing sighting in at the range you
intend to shoot at with the exact equipment and ammo you intend to
use, particularly with a varmint rifle.
Stan