Your standard hand grenade is built to limit the effective radius of the fragments or else it would kill the user too often.
http://www.fas.org/man/dod-101/sys/land/m61.htm
See that fragmentation coil there. It is limiting the fragment killing radius to few meters.
Here is some calculation for the same grenade in ideal conditions
without the fragmentation coil. 185g of Comp-B should be enough to give 2g fragment 480m/s speed at 100m.
http://www.fas.org/man/dod-101/navy/...s/Warheads.htm
Flanker since you've calculate these before then could you perhaps calculate the same thing with 2500g and 300m
If you still after calculating it say that 2500g of explosives cannot deliver deadly fragment to 300m, next step is to take this to Mythbusters.
Some more interesting reading:
http://www.fas.org/man/dod-101/sys/dumb/bombs.htm
Blast is caused by tremendous dynamic overpressures generated by the detonation of a high explosive. Complete (high order) detonation of high-explosives can generate pressures up to 700 tons per square inch and temperatures in the range of 3,000 to 4,500ยบ prior to bomb case fragmentation. It is essential that the bomb casing remain intact long enough after the detonation sequence begins to contain the hot gases and achieve a high order explosion. A consideration when striking hardened targets is that deformation of the weapon casing or fuze may cause the warhead to dud or experience a low order detonation. Approximately half of the total energy generated will be used in swelling the bomb casing to 1.5 times its normal size prior to fragmenting and then imparting velocity to those fragments. The remainder of this energy is expended in compression of the air surrounding the bomb and is responsible for the blast effect. This effect is most desirable for attacking walls, collapsing roofs, and destroying or damaging machinery.
The effect of blast on personnel is confined to a relatively short distance (110 feet for a 2000 pound bomb). For surface targets blast is maximized by using a general purpose (GP) bomb with an instantaneous fuzing system that will produce a surface burst with little or no confinement of the overpressures generated by excessive burial. For buildings or bunkers the use of a delayed fuzing system allows the blast to occur within the structure maximizing the damage caused by the explosion.
Fragmentation is caused by the break-up of the weapon casing upon detonation. Fragments of a bomb case can achieve velocities from
3,000 to 11,000 fps depending on the type of bomb (for example GP bomb fragments have velocities of 5,000 to 9,000 fps). Fragmentation is effective against troops, vehicles, aircraft and other soft targets. The fragmentation effects generated from the detonation of a high-explosive bomb have greater effective range than blast, usually up to approximately 3,000 feet regardless of bomb size. The fragmentation effect can be maximized by using a bomb specifically designed for this effect, or by using a GP bomb with an airburst functioning fuze.
http://www.scribd.com/doc/35978019/T...-December-1943
"SC designates a thin wall high-explosive bomb, achieves its effect chiefly by blast."