"...around 2500fps..." That'd be too slow. Think 2800 FPS with a 150 grain bullet. Reloading will give you better ammo and make the constant search for the best price go away.
There's a lot of nonsense flying around the Internet. I've been shooting an M1 since long before there was such a thing as the Internet. And long before anybody thought the ammo alone can damage a rifle. Any factory ammo with a 150 to 180 grain bullet except Hornady's 'Light Magnum" ammo will be fine. You don't need the daft 'adjustable gas plug' either. That's a marketing thing.
The worst are the sites that say you can't shoot anything but M2 Ball. There was no such thing as M2 ammo until well after the rifle was in production. The Rifle was designed to use and tested with .30 M1 ammo with its 174.5 grain bullet, not .30 M1 ammo.
"...heard it was IMR 4064..." IMR4895 was the powder used during W.W. II. IMR4064 is a reloader's powder for match grade ammo. More that it gives more consistent accuracy than IMR4895 with match grade bullets.