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m1a in 260

Re: m1a in 260

The M1s have been done in non military chamberings in european countries that do not allow military chamberings. I remember reading an article about an M1 in 270 a while back.

For the M14, it might take some experimentation with the gas hole in the barrel diameter as well as possibly the vented plug hole but should be doable.
 
Re: m1a in 260

"Springfield Armory, Inc. offered M1A rifles chambered in .243 Winchester from at least 1978 until 1994 and in .358 Winchester from 1978 to 1980. Barrel blanks in .22, 6 mm, .25, .270, 7 mm, .30 and .35 caliber were offered from 1978 through 1980. Springfield Armory, Inc. would install one of their barrels into a M1A rifle during this period for a nominal charge, $10.00 to $14.00. From 1990 and later, the M1A was available in 7mm-08. These M1A rifles were sold in the United States and in countries where civilians were prohibited from owning military compatible ammunition, e.g., France. For example, Super Match M1A serial number 088619 was custom built in 1995 by Springfield Armory, Inc. It had a Hart 7mm-08 heavyweight barrel and the receiver was rear lugged. M1A rifles exported to Spain are chambered for .307 Winchester."

http://forum.accurateshooter.com/index.php?topic=3781883.0

Post number 3 even list a barrel manufacturer.
http://m14forum.com/m14/39953-m1a-m14-260-rem.html