RAMBLING THOUGHTS
Good question.
First, discard 'rifle' comparison. We're talking (lower-pressure and velocity) handguns.
Next, we MUST consider the cartridge. The 45 ACP gives plenty of diameter for the gas pressure to work against. It has sufficient bearing surface. It has fair sectional density (for its velocity; I mean, comeonnow). 45 ACP cases seem to give symmetrical neck tension. Operating pressure is low.
Now, on to your gun!
You got lucky; you have an accurate gun. Don't care who makes it or how much it costs; there are straight shooters and stinkers.
That said, why does your gun, after allowing that (230g FMJ???) bullet to travel through the air in your cylinder, put the hole where you aimed?
Dunno.
Got some guesses.
Even distribution of gas pressure acting on the bullet base.
Tight(er) chamber dimensions, in your gun.
Holes line up.
Slower launch velocity reduces skidding (I recover many bullets -shot in snow- to inspect skidding).
Best guess -- the large surface area the gas pressure is working against more evenly distributes the pressure, reducing 'tipping' or 'tilt' as the bullets moves from the case until it reaches another obstruction and/or constriction.