I'd be very interested in hearing what his reasoning was behind this theory since both the 308 and 7mm-08 have maximum SAAMI chamber pressure limits of over 60,000 psi. The .308 being 62,000 and the 7mm-08 being 61,000.

If anything the 30-06 would be a better choice considering it's maximum SAAMI chamber pressure is less than both the other twoat 60,000 psi.

The 6.5 cartridge it was designed to safely handle is only loaded to a maximum of 45,000 psi. This would be an increase of about 27% in pressure to get to the 7mm-08 or .308 levels.Think about loading your modern .270 boltrifle to about 89,000 psiWhich is about a 27% increase over it's maximum 65,000psiand asking it to handle this extra pressure on a regular basis.