They had a reputation for having a kick but the way they trained us was to lean into the rifle when you're standing and HOLD the frigging thing.
Don't baby it. Don't anticipate the recoil, just go with it. Take hold of it and put your body behind it and squeeze off the trigger.
Prone was much the same. Always pull it back into your shoulder. I often came home from the range with marks from my shirt imprinted on my shoulder.
It's not bad at all really. But then I shot an M16 and that old war gun was a tame baby compared to the SLR. Put Put Put as opposed to BANG BANG BANG...