Hey Gavin,
Density of Pixel 3 on multiple websites is calculated according to Viewport size that Google has decided i.e. 411 X 823, but as it doesn’t provide exact value I prefer to use 360 which is the default width for Android Devices within perfect aspect ratio, and it scales down to density of screen as 3 i.e. 1080/3, which doesn’t provide half pixels within the layout.
Other min-width that I use is 420, which is near to 411 and does places each and every element to fix-width while maintaining the aspect ratio.