Your father is well equiped. No matter if he is shooting a 7mm Rem mag, or a 280, or a 7X57 mauser, or 7mm-08, or most any other 7mm cartridge out there.

For loads I would start look to the Nosler partition & partition gold, TBBC, Failsafe, Scirocco, Accubond, Interbond. All of these are factory loaded by Remington, Federal, Winchester, and Hornady.