Since M1 Garand is bullet-box activated (a bunch of bullets cluttered together in a box. They go down into the firing chamber as you shoot), M1 Garand CANNOT be reloaded during a clip (8 rounds). So if you have 7, 6, 5, 4, 3, 2, 1, you can't reload.
Rocket launchers (Bazooka, Panzershreck) may be long reload, but with guns, it takes 2-3 hits to take out a guard/infantrator. Rocket launchers take out in 1 hit since they're soo heavy. However, it takes a while to get a hit since it hits so slowly, so click the melee button(right-thumbstick-click) a split second before moving closer to the victim. Knockout death?
With sniper rifles (Springfield 03' or Gewehr 43) when in sniper scope mode, press and hold D-Pad up or D-Pad down to change sight range. Good for diversified enemy areas (ex. Nijmegen Bridge level, Golden Lion level, Lorient Shipyard level [submarine base level]). You can quick scope also when you scope again and the sniper rifle return to sight distance you had it on.
If you hold L trigger and move L thumbstick left, right, up, or down, you can peek out of cover quickly to shoot. This is useful for those levels where there's swarms of Germans firing at your, or those multiplayer pals that work your nerves and push your buttons by charging at your and firing, of spread-firing.