Here is the facts.
Short of paying an over exuberant amount of money on Woodleighs(Australia) or trying some custom made pills for the 303 there are no super guchi ultra permium bullets out there.
The toughest bullets are probably the Hornady offerings with there Interlock ring, next is probably the Speer offerings and most likely then the Sierra offerings, although Sierra's bullets are my choice because they are built so consistantly.
There is no call for a ultra tough, super bonded, this, that, or the other thing, for the typical cartridges that fire .311" bullets, you have no hope of reaching 3000fps safely, let alone 2800fps.
Shoot what your rifle likes and go from there.