.276 Pedersen - Wikipedia, the free encyclopedia

Surprisingly the .276 Petersen fires a 7mm .284 bullet, and the case is 51 mm long, same as .308.
The .308 has greater case capacity, however.

A 7mm-08 Remington has more velocity and power than the .276 Petersen, but similar downrange energy and trajectory, even with lighter bullets.
Sounds like an experiment!