40 Super from 45 Super brass

[HumptyDumpty]

I've got plenty of 45 Super brass, and would like to experiment with 40 Super. Any issues to be aware of? Tips or tricks?

[SOFMatchstaff]

I think you will find the 40 Super is .100 longer than the 45 Super brass. wont work....

[HumptyDumpty]

Darn, so it is.

[j4570]

Could you use 45 Winchester Magnum Brass? Forming and trimming involved obviously. Not that it is any easier to find than 40 Super.

Maybe try to just find some 40 Super via WTB?