I am sorry I was not more clear Randy. The 454 Casull has a higher pressure rating than even the 460 S&W so mid-weight bullets will not show any real advantage with the 460 S&W. Also the length of the barrel and how efficient the powder burns is a limitation of both cartridges. But to be clear, in an all-out power race with 400 grain and heavier bullets the 460 S&W will be the faster of the two, as it has more powder and will push the BIG Heavy Bullets appreciably faster. I shoot 454 Casull out of my 5-inch barreled, muzzle-brake equipped 460 V S&W revolver. I have not had the barrel gap measured but will do so. Out of the 5 inch barrel the 460 S&W would not be as efficient with mid-weight bullets. Just my opinion sir.
Ah ok, gotcha. That would be an interesting study. Please post results if you do a comparison. I turn into a true geek when it comes to this stuff.
Also, you can buy a cheap set of feeler gauges at your local Home Depot/Lowe's if you want to measure your gap.
