I created a simple boilerplate for Bootstrap 4's Grid with the awesome GuideGuide plugin in Photoshop.
The template includes artboards for:
- XL ( 1140px )
- LG ( 940px )
- MD ( 720px )
- SM ( 576px )
- XS ( < SM )
If you don't have GuideGuide I recommend you give it a try. It's a real timesaver and honestly the functionality it provides should be baked into Photoshop.
You can import my grid presets using the gist URL below.
GuideGuide Gist URL: https://gist.github.com/amineo/cc3235877c2bcd10811a62f1bb99dd3c#file-grids-json