@Floridagt500,
I don't actually hate the 6.5 CM.
It's actually an excellent cartridge that works well within it's confines.
Let's look at it objectively, not emotionally.
We have both described it as being designed for match shooting.
Your statement of it being designed for a short action really holds no water.
The 260 Rem has been used in short action bolt rifles for years.
A match shooter doesn't give a hoot if it's longer than the SAAMI 2.80" COAL. They will typically spec reamers with specific freebore and neck diameter.
It is when you get to the MSR platform and PRS matches where issues with the 260 Rem showed up.
Remember, benchrest and F Class do single loading. Many with a loading port on the left side and the ejection port on the right side.
They don't have a magazine.
So now we have 2 platforms that use detachable magazines. (3 now with NRL Hunter matches)
With the long, heavy match bullets there is the issue with the 260 Rem that to fit it in the confines of a detachable magazine the bullet was pushed down into the powder column.
The answer, use a shorter case.
By "improving" the case, and steepening the shoulder angle, you can get almost the same case capacity as the 260 Rem.
In a bolt rifle, with the chamber throated for the heavy, long bullet, the 260 Rem does have a slightly greater case capacity.
My issue with the 6.5CM isn't with the cartridge itself, or the people that like it. It was one of the greatest advertising campaigns ever created.
My issue is with the rifle and ammo manufacturers that jumped whole hog into it.
Looking for a donor rifle in 7mm-08 the other year, you could buy any manufacturer and model you wanted. As long as you chose between 6.5 CM, or 350 Legend.