If worse comes to worse, you can contact Remington and I am sure they can provide you with a magazine. If you have a local gun shop however, odds are good they have one on hand or could order one for you.
If that fails, or you would rather order online, search it in google.
DO NOT DO THIS!!!! The OAL on the 7mm Mag is 2.5 inches and the 7mm Weatherby is 2.55 inches. SInce they headspace on the belt, and due to the freebore in the Weatherby, the 7mm Mag may chamber in the Weatherby. SAAMI lists the 7mm Mag/7mm Weatherby as an unsafe combination one will probably chamber in the other. DO NOT SHOOT UNLESS YOU ARE SURE YOU HAVE THE RIGHT AMMUNITION!!!!
7MM Weatherby Mag.The Remington model 700 classic was first offered in 22-250,6mm Rem,243Win,270Win,30-06,and 7mm mag from 1978-1985.the first limited edition classic was the 257 Roberts in 1982,300H&H(1983),250Sav(1984)350Rem mag(1985)264Rem mag(1986)338 Win Mag(1987)35 Whelen(1988)300 Wby Mag(1989)25-06 Rem(1990)7mm Web Mag(1991)220 Swift(1992)222 Rem(1993)6.5x55 Swedish(1994)300 Win Mag(1995)375H&H(1996)280 Rem(1997)8mm Rem Mag(1998)17 Rem(1999)223 Rem(2000)7mm-08(2001)221 Rem Fireball(2002)300 Sav.(2003)8mm Mauser(2004)308Win.(2005).I hope that you find this informative.
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Why the story entitled origin of fair complexion and fair hair?
Ano ang kahulugan ng iskolarling pagpapahayag?
What is a classified data spill or negligent discharge of classified information?
Ano ang papel na ginagampanan ng mga impormasyong ito sa mapa o sa globo?