I'm not sure the difference in Criterion's 260 chambers, but my 260 tube was ordered shortly after Criterion brought their prefits onto the scene and I had no problem whatsoever loading a 140gr A-Max to the lands and fitting in a short action centerfeed blind magazine.
Running CDI DBM now, I have to use Alpha Type 2 magazines as my load is 2.91" OAL.
The 140gr Nosler CCs will be much shorter to the lands with their tangent ogive than a VLD-type secant ogive bullet like the 140gr A-Max.
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