Asked about putting it in #1, on another forum.
And it is perfect case for the Ruger #1.
The very few #1s ever done in 577, they had to relieve
metal behind the action shoulders that breach block
rests against because of rim. Ours don't have to and the #1s
extractors I've seen work better with belted than big rimmed.
Ours holds more powder, cases built for extreme pressures.Ed

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Ed Hubel