You can safely load a Garand or M1A with any powder in the burn rate range between IMR-3031 and IMR-4320. IMR 8208XBR is right in the center of that burn range, just slightly faster than the 4895's.

Before I went over to the dark side, I burned a lot of pull down 4895 because I paid $6/pound. I did experiment with powders on both ends of the spectrum, but cheap always won out.

There is no reason to load max charges in a rifle that can be anywhere from 50-70 years old. Parts are still available, but getting more expensive all the time. Start low and stop when you get the accuracy you want. Muzzle velocity of M2 Ball was close to 2800 FPS. You can easily beat that but paper, or game for that matter, will never know the difference.