confused
Member
+10|6661|British Columbia
Actually there are three parts to the question.

1).  In Wiki, "Each shot beyond the first has Recoil added to the Deviation. Recoil is cumulative, and the two numbers reflect horizontal (left and right) and vertical (up) effects." suggests that deviation is only horizontal.  That would mean that the cone of fire frequently mentioned in accuracy discussions isn't true.   Has anyone seen bullets shoot below their target?

2).  When looking at the deviation of weapons does a base deviation of 0.8 for example mean meters per 100 metres or cm per 10 metres or something else entirely?  In the sample calculation in wiki

Prone, one shot, zoomed
M16A2 [ (0.3 * 1.0) + (0) ] * (0.8) + [0 * 0.8] = 0.24 Deviation
SVD: [ (5.0 * 0.8) + (0) ] * (0.01) + [ 0 * 0.25] = 0.04 Deviation

If deviation means metres per 100 metres, you would likely miss every shot with the M16A2.

3).  Prone, two shots, zoomed
M16A2: [ (0.3 * 1.0) + (0.2) ] * (0.8) + [(0.1) * 0.8] = 0.48 Deviation on second shot
SVD: [ (5.0 * 0.8) + (2.0) ] * (0.01) + [ 4.5 * 0.25] = 1.185 Deviation on second shot

Is the deviation on the second shot up to 0.48 for the M16A2 or is it always and exactly 0.48? 


Some additional thoughts:

In considering accuracy, does movement affect flight path of bullets?

From Wiki, "Deviation Added per Shot: Another modifier, this number is added Base Deviation for each additional shot beyond the first in a given time period, and is cumulative up to the (maximum) in parentheses. For best accuracy, a slight pause between shots is recommended, as this pause “resets” the Deviation per Shot."  How long is the pause?  Does it vary by weapon?
ScarletPimpFromHell
... this one goes to 11.
+12|6656|Sydney, Australia
hmmm, I always took the deviation as being a fraction of a degree.

For example - and I'll keep this as simple as possible, only using the horizontal plane - when you are aiming at a target your relative deviation would be 0 degree. Once you fire your weapon, adding the effects of recoil etc etc the actual trajectory (prone, one shot, zoomed) of the M16A2 projectile may be 0.24 of a degree to the right or 0.24 of a degree to the left of your aim.

At close range this deviation would have little to no effect and you would hit your target. But at a longer range this deviation in planned trajectory would mean you would miss your target.
confused
Member
+10|6661|British Columbia

ScarletPimpFromHell wrote:

hmmm, I always took the deviation as being a fraction of a degree.
Interesting.  I never considered that possibility.  A quick calculation, 0.24 degree deviation at 100 metres means 0.4 metres or about the width of a person.  But, I can hit a stationery person at 100m with the M16A2 (prone, one shot, zoomed).  Which suggests the deviation is <= 0.4 metres.
Sgt. Sergio Bennet 3rd
Member
+169|7013|Mexico City
just shot to the head............
BallisticallyYours
Member
+23|6898|Chicago, IL
Zoomed, I account for 1 MOA and adjust accordingly.
Todd_Angelo
Leukocyte
+336|6894|Warlord

confused wrote:

1).  In Wiki, "Each shot beyond the first has Recoil added to the Deviation. Recoil is cumulative, and the two numbers reflect horizontal (left and right) and vertical (up) effects." suggests that deviation is only horizontal.  That would mean that the cone of fire frequently mentioned in accuracy discussions isn't true.
No, it says right there dude the two numbers reflect horizontal (left and right) and vertical (up) effects.

You can see this yourself if you just shoot at a wall and watch where the pings gp, it's definitely a combination of up, down, left and right. Check near the end of my video All Out Of Bubblegum, timecode 3:48 (in slowmo just after so you can get a good look).

confused wrote:

Has anyone seen bullets shoot below their target?
Yes. This is one of the things that accounts for the difficulty at hitting hard targets at range when they're just visible over parapets or walls for example.

confused wrote:

Is the deviation on the second shot up to 0.48 for the M16A2 or is it always and exactly 0.48?
Have a look at my post on this page: http://forums.bf2s.com/viewtopic.php?id=64702&p=2

This is actually covered in that section you quoted just under this... the bracketed number after the figure for deviation added per shot is the max amount of deviation.

confused wrote:

In considering accuracy, does movement affect flight path of bullets?
You mean if the shooter is moving? Yep.

confused wrote:

How long is the pause?  Does it vary by weapon?
Too long to be useful No idea if it varies by weapon.


BallisticallyYours wrote:

Zoomed, I account for 1 MOA and adjust accordingly.
Er, what? How do you "account for" random deviation? I've made 5, 6 shots, prone, using the L96A1 and hit a target that hasn't moved only once.

You don't adjust for deviation in this game, you put up with it.
Jemme101
M24 Abuser
+99|6767|Valley of the Dragons
Todd_Angelo pretty much covered it. You can see the deviations for movement in the table [DUCKS]Black_Duck_1 made BF2 Weapons Chart ... Source: TotalBF2 - Forums BF2 Weapons Chart (Update: 09/04/2006) - [DUCKS]Black_Duck_1

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