Dinny did a lot better job of checking out the possibilities than I did.
I just got lucky and bought a DPMS LR6.5 Creedmoor. Best rifle I ever fired.
OCW theory is that the shockwave resonates back and forth in the barrel, and if the bullet and the shockwave get to the muzzle at the same time, accuracy suffers. The .260 and the CM were identical barrels except for the chamber. Everything works in the CM and the best in the .260 was not as good.
Dan Newberry would probably say I was loading to the scatter spot in the .260
Since the difference in capacity is .5grain, "bye bye .260"
I would expect 260AI to be different.
As I became a 6.5CM fan I had 2 Handi's coming out of the pipeline.
One had been stubbed at D&T with an 18" Shilen Barrel and chambered in a short 6.5TCU to use Maxi brass. It was definitely a shooter, but the brass is a b***h to make.
The other was a .223 bull that was rebored to 6.5 with no chamber work. I planned to throat it and make it a 6.5x223.
I decided to go CM with both and had them chambered and rimmed for a .444 rim.
The stub cost me almost as much as the LR6.5.
....but they fit in different spots. The Handi is small and light and...handy.
The LR is not, not, and...not.
There are some awesome bullets available in 6.5 that call for less than 1:7" twist.
http://www.gsgroup.co.za/264109SP182.htmlI had the rebore done 1:7.5"
I was told that Shilen didn't come any Faster than 1:8"
...so the 109gr is the biggest of their bullets I can shoot.
I haven't verified it yet, but it books @3100fps and BC of .571.
...(worth getting the right twist.)
I'm liking the 6.5CM's.
I have a 6.5x55 that is third hand from Tim and Dinny.
...I never got excited about it.
I have a 6.5 Grendel AR. I got it for more reach than a 5.56mm
....at this point I would say that it has a better reach, not more.
My next question is can I make the 6.5CM Handi reach out like Sourdough does with the 30-06?
...but first some tuning.