Nomorecatering. Interesting to note that 250 knots IAS is usually the maximum speed with window heat inoperative because of the danger of bird strike on a unheated rigid windscreen. This must tell you a story?
"whistling" in at 300 knots plus at low altitude where bird strikes are possible makes a bird strike at those speeds potentially disastrous - keeping in mind the TAS is what kills you in a bird strike. I have seen the effect of a seagull strike at 160 knots smack on the windscreen which took out the pilots eye.
It's marvellous fun rocketing along at 320 knots in a jet over the coast at low level below 3000 ft - until one day or night a bird fails to see you in time. Murphy's Law dictates it will go straight through your windscreen and leave you without a head.