"How come nobody is necking a 50 BMG down to .38 caliber? Ultimate wildcat or what? Flat shooting to 1000 yards."
Such monstrosities have been done in the past.
Years ago I read about a project where a man took a .50 and necked it down to .30 caliber.
Bullets were something along the lines of lathe turned brass of about 300 grains.
The barrel better than 6 feet in length.
I forget the specific ballistics, but they were impressive. And the barrel supposedly lasted 30 shots.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.