Sideiron,
The paper patching of leaed bullets was a 19th century expedient to minimize leading and maintain accuracy in sustained fire. Thus it gravitated to the competition target shooting crowd and the "buff" hunters. The military grabbed at it too, but with mixed sucess. Paper patching was deemed too delicate for the rough handling that poorly trained soldiers expose their ammunition to.
Copper, and eventually, guilding-metal jacketed bullets were developed to meet the needs of higher elocities, hotter propellents, and to eliminate the problems of lead fouling and paper patching.
There are probably no real benefits to paper patching of modern jacketed bullets.
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