It came as the wife of a British soldier who died in hospital weeks after being injured in a blast in Afghanistan paid tribute to her 'best friend and wonderful husband'."
The study, co-written by Nicholas Drummond, a strategy consultant and ex-Welsh Guards officer, described British soldiers' rifles as "not much more useful than a peashooter".
Taliban marksmen use powerful 7.62mm ammo for their AK47 machine guns, according to a report of the study in The Sun.
Mr Drummond told the newspaper that a British soldier couldn't attack the Taliban "with any certainty that if he hits the enemy he will kill or incapacitate him."
The study claims the ammunition is easily stopped by car doors. It added that Javelin anti-tank missiles, costing £100,000 each, are often fired at lone gunmen. Only one in four British, US and German troops has been issued with guns using 7.62mm ammunition.
The report calls for guns that take larger ammunition to replace all standard-issue SA80 rifles, which many believe were exposed as inadequate in Iraq in 2003.
The Ministry of Defence told the newspaper the 5.56mm calibre rounds used by United States and other Nato allies are "proven to be both accurate and powerful."
[bth: note the distance of 300-900 meters for half the engagements in Afghanistan. Also one can assume that the vertical nature of the terrain and ambushes from mountains overlooking roads and bases would give the Taliban an added advantage and further shorten the effective range of our rifle ammunition against them.]