I have a very similar sighting system on my .303..was the first center fire I owned..still have it to this day ..was quite accurate for what it was..literally shot dozens of whitetail through the years with it growing up...

Have also used scopes on all my dangerous games hunts..turned all the way down in the bush to 1.5 is not hard to aim with even at close distances..shot my last elephant at 16 yards..no problem. Have had several PH's tell me under most situations, would rather have clients use scopes versus not..1. most shoot better with a scope..2. most see better with a scope if you are trying to snake a shot into the kill zone without hitting a obstacle you might not see otherwise.

Have to say however, would love to use the open sighted double .470 for the buff/ele hunt I am planning...think that along with a scoped 375 H&H would be an ideal combo in a DG area..

Ripp