william dresser addressed this issue years ago. .55 grain of bullseye 1 27/32" barrel, m36, all bullets exited barrel, 148 dewc. 1.25 grain of BE in 6" barrel cleared all bullets from a 6" barrel. HOWEVER ... i have been an eyewitness to oversized plated bullet(WC) in a very dirty rental gun not clearing a 1 27/32" barrel.the sound of the gas coming out the rear of the gun was strange. even the first time shooter knew not to fire again. to remove that bullet we had to drill a hole with a drill press thru the bullet four times before we could drive it out.a cast bullet would have been easier to remove than that soft core plated bullet that kept collapsing when we tried to hammer it out.there are some strange looking rounds coming from the commercial reloaders occasionally .if everyone took a basic pistol course they might look at ammo prior to putting it in a gun.