Well, pair of mags coupled you could have the best of both worlds.
Mag one: 40-60gr NBT/vmax ext.
Mag Two 64gr Bonded solid base/trophie bearclaw/60gr NPT/62gr M855 ect.
I'm of the opinion that it'd be better to just pick one and rock on.
Put a bad guy standing sideways so his vitals need 10" of penetration and give me a magazine of bullets that penetrate 7". I'd bet my life on the fact that he'll end up dead. If I'm gonna shoot once, I'm gonna shoot twice, so put two in him and repeat as necessary. His vitals are gonna be reached pretty quick.
Pick on decent load, practice hitting, and don't worry about if you have the "right" mag in the gun at the right time.
