ORIGINAL: halcon
Other people make magnum primers ,but that said they also have a different burn rate so you might need to test your load results again using another primer . Easier to keep looking if you can wait awhile .
It is my impression that the Federal 215 is the "magnumest" of the magnum primers, so what halcon says here is very true. IF you switch to some other (I hear the Remington 9-1/2M is also a good choice for magnum primer needs, but have not used them myself), drop you charge several grains and re-work it.