How small can I go? Question about screens, line width, and ink.

Hi folks! I'm working on making some designs for a sticker sheet. I'm having trouble figuring out how small I can go with the line width. How small can one realistically print? Right now, my stroke paths are set to 0.248mm. What size mesh would you suggest I use for something this size? Can I go smaller?

I'm also trying to figure out what ink to use. I need something that is water-based, cures without heat, holds small details, and that can be used on both porous and non-porous materials. I will only need black and a background color (preferably metallic gold but I understand this complicates things due to the particle size). I'm leaning towards Jacquard Screen Printing Ink. Do you think this will work okay?

Thank you for any and all help you are able to offer!