Since the original cartridge dimensions around the case head are slightly different than the standard .473 cases of the '06 and its relatives, are modifications necesary you the extractor to properly function with these common cartridges? Also, same question for the other cartridge, which is actually different from both of these examples; that is the 6.5 x 55 which is actually the leading candidate for this build.
I am asking because the barrel maker that I regularly use to install new tubes, does not do any boltface work to help feeding. This is up to the customer to source elsewhere.
Thanks.