Re: True accuracy for long range
Got to agree with JohnM. The weatherby action makes an good hunting action, but never has been known for an accurate LR competitive action compared to the competition.
As for the 30-378 being used as a competitive 1000 yard round. The current stats do not support that anymore, one time yes but not now. The only place it is even being used is in PA. Their last posted match results show that only one Light gun shooter used it with middle of the pack results and 6 Heavy gun shooters used it with 2 not getting all 10 shots one and the others ranging from 14.9 to 24 inches while their relays being won at the 6-8" level.
That is over 200 shooters total of LG and HG and two of the six were Harold Wolfe and his son who are big advocates of the 30-378.
In my opinion, mediocore accuracy action, large overbore cartridge that is not competitive with todays class of 1k guns and cartidges.
However, if you got the money and expertise, the gunsmith has got the tricks to make even Mauser actions shoot at 1000, just not the choice to start with.