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Lead vrs. Jacketed
Hello, there was a comment made about lead being slicker than gilding metal & the need for gas-checks if lead seals bore better. The reason lead bullets tend to have greater velocity than jacketed is the fact there is less engraving pressure with the softer lead. The term "gas-check" has caused much confusion over the years, they really should have been called "driving cups", they really don't seal the bore, as gas still leaks past them, their function tends to act like wrench, which the rifling can grab onto without being worn away from friction on the bullets trip through the bore. There is a point where a lead bullet will properly seal a bore..it is a function of bullet hardness, pressure, and friction. If you exceed the bullets ability to resist further expansion, you will get deformation...bullet nose slump, collapsed lube grooves, gas cutting. Then you will have leading.
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