Not absolutely sure on this but I think the Swift is a secant ogive and the AB is a tangent which gives the Swift a more streamlined nose.....RichJust trying to figure out why the scirocco 2 is so high in bc. The 6.5 130 grn accubond is .488 and the swift 130 is .571. Why is this? any ideas? Thanks Rob.
Are "decent" and "secant" synonymous? Just kidding!......RichFrom another thread.............
I measured a G1 BC of .491 for that bullet. G7 BC is .251.
It's got a decent ogive design, but a poor (short and steep) boat tail for base drag reduction. Certainly not a design that could possibly produce a .571 average G1 BC. Even at 3000 fps, the G1 BC is just .515, degrading to .453 at 1500 fps.
A thick jacket for a long bullet...? Sure it makes the bullet longer, but that doesn't mean high BC. Lengthening the nose and tail will reduce drag, but lengthening the bearing surface does nothing for drag so it's irrelevant.
None of my analysis included group shooting (precision) testing so I can't comment on that. They may be extremely precise, but the BC claim is not accurate.