The G limits on a Spitfire were probably +6 to -3 in normal operation. That seemed to be the range for most aircraft immediately post war. Both the Meteor and the Vampire had G meters with the needles set at that. They could go further, +8 personally, but without a G suit prolonged G of +5 or above would induce greying.
IIRC the Vampire, which had a more aerodynamic wing than the Meteor, would G stall at about 220knots with 6 G applied. I forget what the speed was at 8.