“the draw back of the grand is the same as most autos
But the M 14 is a better weapon for military work the best sniper in the world used one.”
You seem to be contradicting yourself.
In case you have not looked the M14 is an autoloader and a refinement of the Garand. The M14 uses the same rear Sight as the Garand and basically the same trigger group. Changes amount to modification to use a detachable magazine and refinement of the Gas system.
M14’s in Service Rifle competition are capable of competing But It takes a much larger Investment and lots of tweaking. The Garand competes with much less modification. The AR platform Does very well against Both with minimal Investment.