What is the 'sporter' like? Is a special stock that will fit only one barrel shape or larger or is it a cut down military gun?

Why do you want to replace the current barrel and how does it shoot now?

I see little sense in selecting the 7-57 for a large ring full length action.

In general I like the Winchester Featherweight barrel contour and a 22" length.

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All guns should be locked up when not in use!