Re: the best long range varmint caliber
As the bullets increase in diameter and the BC goes up, the bullets just keep getting better and better as far as reaching out to extended range.
The original poster mentioned varmint calibers primarily.
Put everything in perspective as per barrel length and optics and the higher the BC, the better the bullet will fight the wind.
The 107gr match 6mm will beat the 80 gr 224 match bullet---the 6.5 142 Match bullet will beat the 6mm 107 gr and so on.
Of course velocity comes into the equasion also but, when reaching out to extended range but, the higher BC bullet will out perform a lower BC even if it's not going quite as fast to start with.
Another good example is the 30 cal 240 gr with a BC of .711 against a much faster 30 cal 200 gr with a .600 bc. That 240 will eat that 200 gr up even though it may be going 200 to 300 FPS slower.
Point is, the 6mm is a great bullet but, I have found that the 6.5 is better especially when using the same size case with both.