Seems that the only real advantage to 3 inch chambers is about 100FPS gain in most loading over the 2 3/4. Makes sense to me that 2 3/4 would be sufficent, in fact the one I have comming has only 2 3/4 inch chambers, but in a commercial offering it might be that 3 inch is viewed as necessary?

On the other hand, from what I have read it seems that 2 3/4 inch sabots shoot best in 2 3/4 inch chambers and sense they are the standard, and lord knows the gun will be rated to a great extent by how tight it shoots a group, that they might stick with that...........