Just looking at the cases side by side, it looks like the Swift actually has more capacity than the Arrow. Unlike the AI, where the neck is shortened and the case blown out to make the sharper shoulder, the neck is actually lengthened on the Arrow and the shoulder pushed back to form the sharper angle. That's why you have to run Swift brass through an Arrow sizer prior to the first loading. It's not just a matter of fire forming with Swift ammo. Swift ammo will not chamber in the Arrow.
FWIW, using the same bullet and powder, 55 Hor SP and IMR 4064:
Swift - 39.0gr at 3860 Arrow - 37.5gr at 3795
both loads are in the 1/2-3/4 inch range. My Swift is a Pre-64 also.
Last edited by TATELAW; 01/11/16.
Those who must raise their voice to get their point across are generally not intelligent enough to do so in any other way.
