Lead bullets need to be properly fitted, and hardness is NOT an issue unless shooting .357 Mag in carbine.
Lead bullets should be a very snug fit in the cylinder's throats, or very slightly larger.
Almost all lead bullets need to be at least 0.001" larger than the barrel's groove diameter--and, no, your revolver may NOT have a 0.357" groove diameter.
I would NOT shoot thin plated bullets in my revolvers. Unless you only shoot very light loads (650-750fps), you will need a roll crimp. A roll crimp will cut through the plating and the damaged plating can allow the bullet to lead the barrel and there is a chance that a piece of the plating can be left in the barrel.
I shoot only lead bullets in all my revolvers, but if I didn't want to shoot lead, I would be ordering bullets from Montana Gold.
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