In the "crowd" I run with, Ross Seyfried's advice is considered to be the "Gold Standard" and he is correct about the 300 Sherwood; but the 310 is much more available to we peons.
Mike
In this article, he ended with the fact that his dream Martini would be a 300 Sherwood with serious open sights for long range shooting, but the barrel/chamber would be hard to source. He stated, however, that he did want to build one more ultimate Martini and his intent at the time was to make it a .298 since the bullet was for a barrel he could buy and the case was for all practical purposes a 300 Sherwood. That way it would be a custom rifle and not a semi-wildcat. The loads and ballistics he presented did seem to be a step up from the rest of these rounds.