Just to add, having the burst disc fail on your bottle indicates that the pressure has exceeded 190bar... Without the burst disc, the bottle would explode.
When filling cold bottles DO NOT zero the scales with an apparently empty bottle, it may contain dry ice which can affect the filled weight.
You should know your bottles empty weight which you can use to determine the full weight (This should also be stamped on the bottle). DO NOT fill above the full weight.
As Stu has suggested, on a hot day underfill your bottles and dont leave them in the sun.