Re: 6.5 WSM ?
Don't give up on the 6.5 WSM so quickly. When Winchester anounced the .300 WSM, my first thought was that the WSM case necked down to 6.5 would be a great one.
So I had a reamer made and rechambered my .260 Remington in a short action Model 70 to 6.5 WSM. To me it is a little spookey how accurate mine is. Now that there is Norma Brass available for .270 WSM, the 6.5 is very easy to load for; I had to convert .300 WSM brass to 6.5, a more tedious process. Of course, my rifle is a hunting and sporter application and I don't know your intended use but, I love mine.
May the wind be in your face and the sun at your back.
P. Mark Stark