I have been weighing my 4 'jumbo' coturnix since they hatched. Kitchen scales with a large ziploc container to stop them sliding off.
@ 2 days between 7g-12g (~0.25oz).
@ 1 week 22g, 28g, 30g, 31g (`0.75oz - 1oz)
@ 5 weeks 177g, 184g, 191g and 205g (6.24oz, 6.5oz, 6.75oz and the female at 7.25oz)
I also have another hatch but they are only a week old (mixed coturnix) but the smallest is 22g (same as first lot) and largest is 50g!! quite a bit more than the first lot. Be interesting to see how they progress.