PHOENIX PHIL
AH ambassador
the logical best medium between the solid lead bullet and the solid copper/brass bullet is the dual core lead bullet. this brings out the Nosler partition and the Swift A-frame. for heavy game the A-frame is the better choice between the two as it holds its weight better then the partition. but then again even the mighty A-frame can fail. the A-frame can suffer from a similar problem as the mono-metal bullets, it can fail to fully expand at low velocities. in general i personally wouldnt recommend running a Swift A-frame any slower then 2300fps or you risk less then full expansion.
-matt
Does it need to be a dual core lead bullet? Aren't the NF bonded cores essentially the same as an A-Frame in performance?