Regarding cold gas, I found this analysis [1], that essentially says that within 40% of vehicle mass will get you to 500-1000 m/s, dV growing as square root. So

Regarding cold gas, I found this analysis [1], that essentially says that within 40% of vehicle mass will get you to 500-1000 m/s, dV growing as square root. So it won't make it into lunar orbit. [1] https://digitalcommons.usu.edu/cgi/viewcontent.cgi?filename=0&article=1225&context=smallsat&type=additional https://digitalcommons.usu.edu/cgi/viewcontent.cgi?filename=...