Curt is correct i'll add think of Swift bullets as heavier constructed Noslers, similar in design with some differences. A-Frames have a bonded nose section and uses pure lead and copper. These can be advantages in some scenario. Anytime you harden things like lead and copper it can fracture and lose weight given extreme impacts. Softer pure lead and copper has a tendency of flowing or mushing back for lack of a better term before fracturing. A-frame front sections are bonded Noslers are not. I've had partitions grenade and completely come apart, and more than a few times lose the nose section finding only the rear section inside the elk in different places. The Scirocco's on the other hand are basically a variation of Accubonds and IMO slightly better construction due to the pure copper jacket. The downside with 25 caliber Sciroccos is they are only 100 grain whereas 25 cal accubonds are 110 grain. I wasn't all that impressed with 110 grain accubonds on elk this year 3 to 4 inch entry hold, thru a rib, bullet came apart and no exit although the cow elk dropped right there. Too bad Speer dropped TBBC bullets plus I'm not sure if they made a 25 cal anyway. Federal has a slight incarnation of the TBBC called Trophy bonded tip, which is loaded ammo and not in calibers less than 270. TBBC were really good bullets (trophy bonded bear claw ). If I were going to use the 257 again on any elk it would either be Swift A-frames 120 or Barnes Tsx 115's . Deer lighter bullets are not as important, but elk think driving bullets as deep as possible and breaking everything in the bullets path, forget these bullets that fragment and come apart you need the best possible controlled expansion bullets that shoot well in your rifle.
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