.30-'06 in 8mm Mauser? No way. 8mm Mauser in .30-'06? Maybe if tolerances work just right and a lot of force is used.
.30-'06 in 7.7 Jap? Again, no way. 7.7 Jap in .30-'06? Yep, I tried it. Not only fires but shows no excess pressure signs. The only result is a short neck case.
Jim
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