Re: 6.5-06 vs. 6.5-284 for long range work?
In rifles of equal quality, the 6.5-06 will shoot as accurately and as well as a 6.5/284. The 6.5/284 has the advantage of being a more modern case design, which will require less full length sizing and trimming, generate less bolt thrust, etc. Ease of case availability is not normally a major issue in making a chambering decision for a long range precision rifle, though case quality (eg Lapua, RWS, etc.) usually is a deciding factor.