Home Forums Reloading Big Game Rifles 7mm Wby to 7mm Rem Mag Interchangeable Data?????

Using 7mm Wby loads in a 7mm Rem Mag is courting disaster.

The Rem freebore is .2845 diameter .1142 in length with a 3 degree lead (6 degree included angle).

Wby. freebore is .2844 diameter .378 in length with a 1.5 degree lead (3 degree included angle).

Looking in Nosler number 6 manual at the 150 partition the Remington 7mm Mag. uses 63 grains of IMR 4350 for a max load.

They Wby 7mm Mag. uses 66 grains of IMR 4350 for a max load which would equate to a 3 grain overload in the Remington.

I own both and would not tread there.