The bullet bibliography style is based on natbib, the aas_macros, and the Monthly Notices .bst file mnras.bst.
The latter file is changed in a single line, to set maxauthors=1 in the bibliography. I think there is no other way to set this parameter.
Below is an example of how to use the bullet bibliography style. Please star the repository if you find it useful.
These are the top ten papers by citation count in the NASA ADS: Shakura & Sunyaev (1973); Schlegel et al. (1998); Riess et al. (1998); Planck Collaboration et al. (2016, 2020); Perlmutter et al. (1999); Perdew & Zunger (1981); Novoselov et al. (2005); Astropy Collaboration et al. (2013); Abbott et al. (2016)
Below you can see how the resulting bibliography looks.
• Abbott B. P., et al., 2016, Phys. Rev. Lett., 116, 061102 • Astropy Collaboration et al., 2013, A&A, 558, A33 • Novoselov K. S., et al., 2005, Nature, 438, 197 • Perdew J. P., et al., 1981, Phys. Rev. B, 23, 5048 • Perlmutter S., et al., 1999, ApJ, 517, 565 • Planck Collaboration et al., 2016, A&A, 594, A13 • Planck Collaboration et al., 2020, A&A, 641, A6 • Riess A. G., et al., 1998, AJ, 116, 1009 • Schlegel D. J., et al., 1998, ApJ, 500, 525 • Shakura N. I., et al., 1973, A&A, 24, 337