I've taken deer with a .44 Mag, but not a .357 Mag. However, a .357 with a good bullet will definitely take a deer. A 158 grain bullet used to be the standard, but now they have 180 grain bullets.
What tips are you looking for? I hunt with a scoped .44 Mag that is sighted in for 100 yards. But I also have an iron sighted .44 mag that I carry when my primary weapon is a rifle. With iron sights, I limit myself to 50 yards.
Best advise is to get out and practice.