From http://en.wikipedia.org/wiki/M24_Sniper_Weapon_System:
"The United States Marine Corps also employs another variant of the Remington 700 as their standard issue sniper rifle, with the model name M40. The main difference between the M40 and the M24 is that the M24 uses the "long" version of Remington 700 receiver versus the M40's "short action". The M40's short receiver is dedicated to cartridges that do not exceed the length of the issue 7.62 x 51 mm NATO round. In contrast, the M24's longer receiver allows the rifle to be converted from 7.62 mm NATO to the more powerful .300 Winchester Magnum cartridge. The U.S. Army specified this capability in case future tactics required the larger cartridge's extra range and penetration."
God helps those who help themselves. For everyone else, there's wikipedia.
The 25th ID’s upgrade effort involves sending the existing M24s to Remington, where they will be fitted with a new barrel, a new bolt face, a special folding stock and a more powerful optic. Each upgrade would cost about $4,000, said Mike Haugen, director of international military and law enforcement sales for Remington. Standard M24s cost about $6,700, he added.
did they ever do that? I was just wondering because I saw the Top Sniper... They said the "M24 in 308"...