The interlock is a great bullet. I've never seen the need to try any of the other more expensive pills Hornady offers. Except for the A-max and V-max for tagets and varmints...
I'd do exactly like Ken suggested:
270= 130gr. or 140gr. btsp interlock
7x57= 154gr. interlock....
Having used the 162gr. BTSP interlock in my 7mm rem mag, with great success on muledeer, I'd bet the 154 would work like magic in the 7mm mauser..