Do this simple test, from your usual shooting position over short grass, jack a live round through a cycle and eject it. Then do the same thing with a fired round.
The heaviest part lands first. Similar situation occurs in the mag, bullet follows gravity. BTW reason I said over grass was you'll find the live round pdq not so the fired one, it demonstrates the physics of the phenomena.
Gun may not be horizontal don't matter. Gravity is unidirectional and,in this case, spring assisted ie the magazine spring exerts a force that is generally adequate to maintain the cartridges in the position they were loaded in. In my case this would be bullets pointing to the left as I load the gun with mag port pointing upward. Probably the only time when it's possible that the spire point contacts the primer is when the gun is either pointing vertically upward or downward. Can't recall the last time, in peacetime, I've seen a gun fired in either of those directions.
I normally shoot cast bullets with a flat point and don't normally load more than 3 rounds in the gun unless there are hostiles around
as there's no real need even when out hunting.
But you can do what you want with your property, I was merely pointing out it may not be as cut and dried as the flat earthers would have us accept.