Re: who can build me a 50 whisper?
I second Collier rifles. He is currently building me one, 12.7x48mm Hush. So he has the dies so that will save you from having to buy a reamer, chamber gauges, etc. Mine is being done off a remington 700 so he;s opening up the boltface and installing a sako style extractor as well. He does great work. This will be my 5th gun he has done for me, and he has always done work way beyond my expectations.
His phone number is (706) 871-9520 if you want to speak to him on the phone.