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Although I do not own a Rossi I do shoot a Marlin 1894 in 44 Mag and I use .432 cast bullets. 1st thing is to slug your bore with a soft lead fishing sinker (the egg kind) and measure the size of your rifling (dont know if Rossi uses micro groove or Ballard) but it should come out somewhere in the .430 range. What ever it is go .002 over and yes pushing a lead bullet to slow will also cause leading.

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