Will, the simplest way to increase speed is to rechamber to 375 Weatherby - the Weatherby improved version of the H&H - and pick up 200 fps with the 270 ( to 2940 fps & 5181 fpe ) and 250 fps with the 300 ( to 2800 fps & 5223 fpe ). You can still shoot 375 H&H factory loads in it to form cases. The 375 Weatherby has been considered obsolete since Roy took the 416 Rigby case, added a belt, blew it out and necked it down to make the 378 Weatherby, and Weatherby itself no longer loads ammo for the 375. A-square loads it though.
Of course doing that would increase the point blank range of the rifle, so it would only be fitting to use a 30" Sirupati rather than the Salyan in order to increase bayonet range by an order of roughly the same magnitude.
Versimilitudinally Semi-Sincerious, "Slipstick" Slate.
[This message has been edited by Rusty (edited 05-06-2000).]