Certain projectiles in some rifles will move off a load if you were to have the barrel pointed at the ground and walked in... that is the reason for the advise to check you load on stand and make sure it has not moved. I've yet to have a load move off a powder charge while shooting out of a tree. I think that is because you are not really forcing the projectile to move off the load. Granted, if I loaded a minnie, I could stand in my treestand and shake that back out. But the key point is shake that back out. Most sabots are not going to move at all off a charge. I have talked to a person that claimed they had a powerbelt move off a charge in a Knight rifle. Due to their bore size, I have no reason to doubt them. Still, you have very little to worry about them falling out. Even with my smoothbore rifle.

As for the angle, it is the same as with any other rifle I have shot out of a tree stand. Not really a problem is what I am trying to say.