I have several Pietta Remington '58s and my favorite one made in 2000 uses .451 round balls perfectly with a nice shaved ring. I tried to ram a .454 in once and it felt like I was going to break the rammer. I also have a newer Pietta with the short barrel made in 2007 or so and it takes the .454 balls with a nice shaved ring. To add to the confusion, I also own a Pietta '58 "Shooters" model with the Remington barrel address on top and a silver plated trigger guard and it takes a .457 ball just like the Ruger Old Army.
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