None of my ammo is reflecting the 1.3 patch changes so no DT bonus on 5mm and increased condition penalty on .308 JSP. It only affect ammo though as the rest of the guns indicates the appropriate changes. I remove all my mods and start a new game but this issue still persist. Changes made in earlier patches, such as to energy weapons ammo DT bonus, are still there.

Is the new patch ammo stats reflected in the game or they just work behind the scene ?

Any help will be appreciated

If you removed other mods the only possible explanation I can think of is, you don't have the lastest patch installed.
Or your looking at 5.76mm ammo and not 5mm and your looking at regular .308 and not the jsp.

That is strange though. As stated earlier, all my guns reflect the changes in the patch 1.3. Furthermore, the game version is correct under launcher.exe properties. It is just the ammo that do not update.

From the looks of it, your FalloutNV.esm only half-updated.. for some reason.

Try moving it from your data folder to somewhere else, like your documents or something, then verifying your cache via Steam. It should re-download FalloutNV.esm. See if that works.

I am on the console but he is right, as .308 jsp still says x1.5 condition. Same with 5mm DT changes as none of them show up. After using the BAR more and shooting off some .308 jsp rounds I don't see any change.

What I'm seeing when I look at the ammo page in the pip boy for .308 JSP is 1.3x DAM, but it doesn't show the CND penalty. The regular 5mm doesn't show the new DT modifier either. I've verified my game files, they check out. I looked in the GECK.and it does have the 1.5 CND multiplier attached to it. The 5mm also has a -10 DT in the GECK, but it doesn't list it on the ammo stat page of the pip boy.

If it was just the PC users I'd say it could possibly still be some kind of leftover mod effect (eg not deleting actual mod files from directory or something), but if it's on consoles too, then, yeah...sounds like it's not updating correctly. Re-install/re-download would be what I'd try next.

well the patch doesn't work properly for some people and there have been other issues with it so I would assume that's the issue, unless the patch has been re released in which case I would guess that your donwload got interrupted or didn't install properly delete it and try again that's about all you can do.