Title says it all. M24 has a decent bolting speed but the Mosin by far the worst bolting speed i've ever experienced in any game even with the greased bolt upgrade which seems to marginally improve things.
Reloading bolt action rifles shouldn't require you to grab a single round, one at a time, out of your pocket/pouch individually, and extremely casually/slowly to depress into the chamber. At least have a sense of urgency when reloading rounds in a handful or match the speed of loading a shell into a shotgun.