The Speer 400gr actually has a tougher jacket than the 405gr rem bullet. I've cut them both in half and shot them from my BC. Never got to hunt with them, but shooting them into dirt, the Speers never seperated from the jacket, and the rem's almost always did.
The Speer was more accurate in my BC as well.
I'd find an accurate load at about 1600fps and it will be unstoppable.
Oh, yes, buy the rest of those bullets. That's a steal.