Depends on the launch system, you usually see around 1-1.5 g's on most magnetic based ones, hydraulic range from 1-2 g's, where as compressed air can range from 1 all the way up to over 4 g's.
It all comes down to average g or peak, average would probably be more sensible in NL at least. So the 4 g's that Dodonpa pulls initially is out of the question (average g on Dodonpa is around 2.7 g's)...