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The rim diameter for the 308 etc cartridges is .473" while the 6.5&55 is .4803". I found that with high quality shell holders if a .308 shell holder was used that the cartridge could not properly be...

Yep. Fair idea.
What I also discovered with 7*61 & 308Morma magnum was that if I dropped back mv / pressure a bit the trajectories and energy dropped very little and cases deformed far less. Then...

At the end of the day though in my e perience; whereas with care a handloader may achieve 15+ reloads from a .308 case, I found 4-6 is about .y limit for belted brass. The special sleeve die grandpa...