No, a 25/06 IS a 30/06 casing necked down to accept a .257" bullet. It can't be legal as it does not push a .308" bullet. It's parent casing does not matter.
Take a 300 blackout/AAC/Whisper. It is a 223 Remington casing necked up to accept a .308" bullet and is a legal round under the current regs. Easy peasy.
"The bottom line is, if you shoot something, be proud of it. If you can't be proud of it, don't shoot it. God didn't create any "justs." Neither should bowhunters." -Dwight Schuh
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