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Odd ball? hardly, Thanks for the link though!
For what bullet and which brass are you using? Lapua 30-06 necked down to 6.5 will do 3200fps with a 140 Berger out of a 6.5-06 Ack. Imp. I would guess a non improved version would be 100ish FPS slower. There isn't much case capacity gained with improving the 06 case but you'll rarely ever have to trim a case.
Also, nearly all reloading manuals have the 6.5-06 listed.
well i beg to differ i have a 264 win mag that has been handed down for years and it has over a thousand rounds easily through it and it still shoots 1/2 to 3/4 in groups and does over 3100 fps with 140gr