Your L96 should be hitting a lot further than that if you're shooting close to 500fps.
My old Stock Warrior with a few DIY mods could hit near those ranges, let alone an upgraded.
Not a dig, just curious
Completely depends on Joule creep. Measuring 500 on a .2 would preobably be creeping by 60fps (So 390ish on a .43) so you'd be achieving 75-85+ meters. I had all this with my VSR, I run that at dead on 2.32J and 65-70 max is my useable range.