Well I just answered my own question!! I measured the .303 case just in front of the rim and it's .020 larger than the .38-55, so the chamber area would not clean up to accept the smaller case, you can't add metal so a re-bore won't work. My other option would be a reline to .32 Spec., 'cause that feeds ok, but that's not a lot different than the .303, performance wise.
- In case your wondering, I already have another .303 barrel, other wise I'd do a re-line.
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