Hi bigmbogo

Quote:


This is a perfect example of someone quoting a completely mythical effective range for a rifle. Run a ballistics calculator, and you'll see that a .303 174gr spire point bullet starting out at 2400fps drops 288", or 24 feet, at 750 yards, or 56 FEET at 1000. If you can hold the height of a five story building over a target the size of a dinner plate, you're a better shot than I.

We need to check our facts before we go quoting life-or-death techniques here, folks.



I've tried to get some data on the Mk8 .303, this was the best I could find although the balistic Coefficient is just an estimate being boat-tail ammunition.

Muzzle velocity - 2,550 ft/s (780m/s).
Weight - 175 gr
Balistic Coefficient 0.55

giving the following data calculated from http://www.eskimo.com/~jbm/calculations/traj/traj.html

Range 200 yards ; Drop -6 inches ; Velocity 2249.8 ft/sec Mach 1.994 ; Energy 1966.5 ftlbs ; Time 0.121 sec

Range 400 yards ; Drop -39.7 inches ; Velocity 1966.2 ft/sec Mach 1.743 ; Energy 1502.0 ftlbs ; Time 0.536 sec

Range 600 yards ; Drop -103 inches ; Velocity 1707.1 ft/sec Mach 1.513 ; Energy 1132.2 ftlbs ; Time 0.863 sec

Range 800 yards ; Drop -227.4 inches ; Velocity 1477.6 ft/sec Mach 1.310 ; Energy 848.3 ftlbs; Time 1.241 sec

Range 1000 yards ; Drop - 409.0 inches ; Velocity 1286.1 ft/sec Mach 1.140 ; Energy 642.6 ftlbs; Time 1.678 sec

The drop is around 34 feet for 1000 yards using Mk8 ammo. The drop isn't really the problem its how consistant and how predictable the drop is to acheive accurate groups. It should also be noted that at 800 yards the 0.303 still has more lethality energy than the M16 NATO 5.56x45 mm at 400 yards or the AK-47 7.62x39 at 300 yards. I think that the Lee Enfield No4 has iron sights graduated up to 1500 yards or about 1 mile (its been years since I've held one) but the usable range using iron sight would have been around 600 yards.


http://www.youtube.com/watch?v=7B9NkQldeu0&feature=related

Hitting a dinner plate sized steel plate at 860 yards with 5.56x45mm balistics (about a 19 foot drop 300 ftlbs final energy and 1.3 sec flight time)





Edited by Am_Fear_Liath_Mor (05/02/08 07:15 PM)