In a case the size of a 308 win, using a powder like Varget, is there any benefit to going with a long barrel length (26-30) as opposed to a 22 or 24 inch tube? In theory, you should have the powder burned completely in the first 20 or so inches. I am not looking for speed, 2700 to 2800 fps with a 168 grainer is plenty for what I am wanting. I am, however, looking for compactness (is that even a word) and manouverability. Any wisdom out there?