Daryl,

Did you mean 400 gr Speer in 45-70 H&R (not H&H)? if so, yes Bang/splat ,but I think they are a little soft for the real big stuff ,back then I could not get many good bullets for the 45-70 ,I think I would try a Swify A frame in 450gr if you can get them ? @ 1800 + fps ,Now days we don,t need to do that & the 458 Win is great on all of the big stuff,I think most of these folk read too many stories ,because the 458 Win is plenty ,it,s just plain with no story selling ability (only bad stories ) I,m sure Australia is as hot or hotter then Africa and not frozen guns there ,don,t get me wrong I like the Lott ,just don,t need it !

No dam spell check !!