I have three barrels for my R8 - 6.5x55, 30-06 (Blaser) and 308 (J Sip and Sons).
I do not load to max velocity, neck size for all three calibers.
The 6.5 and 30-06 have 400+ rounds down range (100 pieces of brass each) and have not yet needed the shoulder bumped. The 308 barrel is new and is showing signs it may need full length sizing every two firings ( only 150 firings so far).
