RE: 7mm Ultra Mag
There are still some of the old loads out there other than the Remington 140 gr. Core-Lokt ultra. Try Natchez Shooters Supply, Midway, Graf & Sons, Cabelas, Bass Pro, & the otheronline retailers. This will be your best bet. However, you could look to someone like Conley Precision Cartridge. They load custom ammo and have many load options available. I think you have to order at least $100 worth of ammo for them to accept your order. Also, take a look at Noslers Custom Ammo they may have a few loads for the 7 RUM. Otherwise it will be handload only.