gei

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I don't have a .470 but found Woodleigh Weldcore RNs worked well in my .375 (300 gr) and .450 (480 gr) on African Cape Buff (.375) and Aussie water buff (.450).

The Swift A-frame would be a good bullet too if you can work up a load.

Using the second barrel for a FMJ (not a 'solid') also sounds like good advice.

What make is your new .470 ?

Good luck on your Tanzania safari too.