Excess headspace...and then there's this!

While it could be, the case head on the 6.5 is significantly different than the 06.
Did some research, the case head on the 6.5 x 55 is aproximately 1/100 inch bigger than the '06. The 6.5 A-Square (6.5 - 06) is about .3" longer.

No commertial ammo available; A-Square is defunct. The bolt would work, but be a tad sloppy with the 06 case.
 
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