a good friend has a .338 lapua. at least he says he does.

i would love to take that soldier's rifle and try that shot, at a man-sized target. same conditions. i would love to see how much (or little) i miss by.

i did get the chance to lob .50 at 500 meter targets with the military. they were practicing at a range that i was sighting in my deer rifle. i kept hearing this massive BOOM!. of course i went to investigate. they were shooting big sniper rifles, and asked me, "do you wanna try?" HELL YES! i had to wear a flack jacket. the rifle was nestled in many sandbags. i was popping that 500 meter target with ease (well, i at least hit it a few times). it kicked like a mule. scary.

The target that the Sniper engaged was over 4x father away.

In a shot covering 1 mile plus a wind gust 1000 yards down range could make even an otherwise perfect shot miss by tens of feet.

if someone with some skills measured distance and wind..and gave me the scope settings..i think i could "wing" a target by a few feet. it would be a good time trying!

.338 lapua- is what that gun is generaly chambered for
a new caliber as of a few years ago that compares balisticly is the .408


.338 bc-.871
.408 bc-.934
.50 bmg bc-.670
.308 bc-.477

BCBullets = ballistic coefficient
SD = sectional density, SD = mass of bullet in pounds or kilograms divided by its caliber squared in inches or meters; units are lb/in2 or kg/m2.
i = form factor, i = ; (CG ~ 0.5191)
CB = Drag coefficient of the bullet
CG = Drag coefficient of the G1 model bullet
M = Mass of object, lb or kg
d = diameter of the object, in or m
This BC formula gives the ratio of ballistic efficiency compared to the standard G1 model projectile. The standard projectile originates from the "C" standard reference projectile defined by the German steel, ammunition and armaments manufacturer Krupp in 1881.[3] The G1 model standard projectile has a BC of 1.[4] The French Gavre Commission decided to use this projectile as their first reference projectile, giving the G1 name.[5][6]

A bullet with a high BC will travel farther than one with a low BC since it will retain its velocity better as it flies downrange from the muzzle, will resist the wind better, and will “shoot flatter” (see external ballistics).[7]

When hunting with a rifle, a higher BC is desirable for several reasons. A higher BC results in a flatter trajectory which in turn reduces the effect of errors in estimating the distance to the target. This is particularly important when attempting a clean hit on the vitals of a game animal. If the target animal is closer than estimated, then the bullet will hit higher than expected. Conversely, if the animal is further than estimated the bullet will hit lower than expected. Such a difference in bullet drop can often make the difference between a clean kill and a wounded animal.

This difference in trajectories becomes more critical at longer ranges. For some cartridges, the difference in two bullet designs fired from the same rifle can result in a difference between the two of over 30 cm (1 foot) at 500 meters (550 yards). The difference in impact energy can also be great because kinetic energy depends on the square of the velocity. A bullet with a high BC arrives at the target faster and with more energy than one with a low BC.

Since the higher BC bullet gets to the target faster, it is also less affected by the crosswinds.

Well accurately measuring the wind and range is the whole trick, isn't it? :D

I wonder what the bullet drop is for a .338 lapua at 1.5 miles. It's probably about 50 feet, lol.

range would be ok, with a modern range finder or GPS...whatever the pro's use. that moistened finger held in the wind trick i use, would suck. :)

There's an app for that. :)

http://forums.pelicanparts.com/uploa...1272924556.jpg

Bulletflight 3.1.0

By the time I pushed all those buttons the deer would be in the next county.

What the hell does that mean Mark ??:D

Yeah, and at that range, being off by 50 yards on the range call, or 1 mph on the wind can be a miss by several feet.

I bet it was more than that.

I don't have access to my ballistics calculator at work, but a while back I ran the numbers out to 1000 yards for a .338 Remington Ultra Mag for a buddy who was looking for a long range elk rifle, using the Sierra 250 gr Gameking at 2900 FPS.

At 1000 yards, with a 300 yard zero the .338 RUM has about 20 feet of drop and about 5 1/2 feet of windage in a constant 10 MPH 90deg crosswind.

If you miss the range by 50 yards, and it is really 950 instead of 1000, you missed by 3 feet.

Keep in mind, this is at "only" 1000 yards. The shots we are talking about were 2700 yards.

Now the 338 RUM has slightly less velocity than the Lapua, plus I believe The Lapua uses heavier bullets with a slightly higher BC, so it should be a little better than this, but not much.

Someone want to run the numbers?
JBM Ballistics

I use the Shooter app on my Droid.

Works at least as well as the stuff from Cheytac.

http://forums.pelicanparts.com/uploa...1272993375.jpg
lots of dropping

Did I just read 170ft drop?

yes and it is only moving at the speed of a hand gun round

http://forums.pelicanparts.com/uploa...1272994104.jpg


a bit more info on the decay of the trajectory

like lawn darts ..
just further...& no Mom to spoil the fun..

Rika

No. 4843 inches of drop is ~403 feet. There is ~45 feet of drop between 2600 and 2700.

What was the initial zero on that, maybe I am blind, but I don't see it on the input parameters.

Gadzooks.

so, do we still believe this story?

this just shows you that when the bullets hit there targets they were falling more than they were moving forward. also the marksman had to make some estimits on drop and windage because his scope probably didnt have the range of ajustment to aford 171 MOA ajustment.

Impressive shooting indeed...kind of hard to figure the drop unless we have more input on the Brit ammo...

A friend who is really into this stuff advised me to sight in 2" high at 100 yards for my Ruger M77 in 7mm Rem. Mag. caliber...he said this would put me in kill shot area out to 250 yards or so...

He also said 7mm, .28 caliber "flies well"...meaning a good ballistic coefficient, better than .30 caliber. This helped me pick 7mm Rem. Mag. over 300 Winchester Mag. as an elk hunting round...

I wasn't too interested in knowing much beyond that...I sighted in using Norma brand 160 grain ammo...boat-tail bullet. It works...:D