.454 is probably the most common size for .44 repros, so I'd try those first. You want them large enough to shave a ring of lead off the sides when you ram them into the cylinder. If the .454s go in too easy and don't shave a complete ring, you should use the .457s; if they seem way too big try the .451s.
Go with .454s. It's all I've used for decades. Simplifies things to have one size ball for my .44s.
I don't own a Ruger Old Army, or I'd be using .457 balls, or casting my own of around .460 inch.
For my Remington and Colt repros, .454 works fine.
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