Project Reality Forums

Jonny wrote:seems fine to me, less than a pixel out, so that will be rounding errors.

The dragunov's crosshair is not exactly in the center of the screen, so I guess that may be the reason.

KP wrote:What is needed on the L115? I've got some info on various weapons bookmarked...

If you could find wich bullet is commonly used with L115, that would be great.

edit: Jonny, look what I found:
http://www.nfa.ca/nfafiles/cfjarchive/b ... cchart.doc

i think the l115a1 uses a m118 round, it is a 7.62 sniper round. the m16, m249 use a m855 round with m856 tracer mixed in.

the bc for the m855 is 0.304

here is a site with some info on 7.62 rounds
7.62mm (7.62 x 51 mm) Ammunition

info on 5.56
5.56mm (5.56 x 45 mm) Ammunition

50 cal info
.50 Caliber Browning (12.7 x 99 mm) Ammunition

The L115 uses the .338 Lapua round. There are several different loads available, including 200, 250, 275 and 300 grain (13; 16L; 17,8 and 19 grams) According to the Brit Army web site, the muzzle velocity is 936 m/s.

For ze Germans, the cartridge is a .300 WinMag. According to Wikipedia, the "velocity with a 180 grain projectile at max powder charge and 24" barrel is 2975 ft/s ±25 ft/s (907m/s ±7.6m/s)." 180 grains = 12 grams.

KP wrote:The L115 uses the .338 Lapua round. There are several different loads available, including 200, 250, 275 and 300 grain (13; 16L; 17,8 and 19 grams) According to the Brit Army web site, the muzzle velocity is 936 m/s.

For ze Germans, the cartridge is a .300 WinMag. According to Wikipedia, the "velocity with a 180 grain projectile at max powder charge and 24" barrel is 2975 ft/s ±25 ft/s (907m/s ±7.6m/s)." 180 grains = 12 grams.

Thanks, but we need to know which bullets are common within British and German army. Because different .338 Lapua rounds have very different ballistic performance, so we can't just pick any bullet we like.

wel also need to ask the devs what the mec uses cus it is made up.

Wikipedia mentions "a typical military .338 Lapua Magnum load using Lapua LockBase B408 bullets", so I reckon you should go with that. It's a 250 grain or 16.2 gram round.

For the .300 WinMag, go for the one I mentioned. The .300 WinMag isn't mentioned in the chart you posted, by the way.

well that round has a bc of 0.662

so using the calculator it says the round would take 2.248sec to travel 1371m.

i will start to work on the drag.

KP wrote:Wikipedia mentions "a typical military .338 Lapua Magnum load using Lapua LockBase B408 bullets", so I reckon you should go with that. It's a 250 grain or 16.2 gram round.

For the .300 WinMag, go for the one I mentioned. The .300 WinMag isn't mentioned in the chart you posted, by the way.

So I guess it'll be B408 for the British. Thanks KP.

@Jonny: the bullets are hitting the target 10cm above the crosshair at 300m. Is that the rounding errors you were talking about?

what bullet does the m40a3 use?

i have almost got the drag for the m855, working on the drag for the m408.

Don't want to distract you guys from the serious work going on here.. But you all rock!

Thanks!

-REad

zangoo wrote:what bullet does the m40a3 use?

A .308 round, the M118LR. Muzzle velocity is 2670 FPS, but I only saw that once, so I can't double-check it to make sure at the moment.

i looked around, and found a website that says the m118 is the current sniper round, but the army is going to be moving to the m118lr soon.


also we need a dev to pick what rounds the mec are issued cus it is made up, or jonny could do it.

Why not check which rounds they're issued in the in-game files, as how the game models weapons is based largely on which projectile they fire, isn't it?

Well I wanted to check your ballistics with the ballistics calculator first, but since your ballistics dont work for me, I guess I won't.

lol, Jonny of course I don't mean it should be like in ballistics calculator I know that bf2's drag is very far from beign perfect. I just want to make sure that the bullet's trajectory has at least approximately same max distance from line of sight as it is IRL.

So if you say that 10cm is OK, then I guess I'll start testing.

Use the M118LR for the M40A3. According to Sniper Central, that's what's used, and they're usually pretty much spot on.