Home Forums Hunting & Shooting Ask The Gunwriters Magnum primers in standard loads?

My 300 Win Mag target rifle load uses Federal 210 Match, easily lights off ~80gns of H-1000 at sub zero temperatures.

Now that primers are in short supply I took a 0.7 moa @540 yards 5 shot group load and directly substituted Remington 9 1/2 Mag primers that are ~32 years old ( I have several thousand left over from the previous primer shortage).

The 5 shot group is slightly better or at least the same , as conditions will alter the group size somewhat day to day. A sample of one to be sure.

As others have stated , build the load around the primer and other components.

Because of cold weather , Mag primers are used in hunting loads in 30-06 and up.