You could just buy a box of factory ammo (expensive I know) and just use those empty brass. But if they work at the longer case length then even better.
Let us know
Let us know

Skip they bought bullets and powder...it is up to me so a trimming I will go...thanksWith the little rubber tip on those bullets, they will not chamber in a levergun in a full length case when crimped in the cannelure. Believe me, been there, done that.
Hornady shortens the cases so they will. That is the whole purpose of the round. "To turn a pistol caliber levergun into a high powered rifle!"
All kidding aside, take a regular case, one from any other ammo than Leveroution. Then, take one of the cases from the ones that your MIL and wife bought, measure. Let us know what you come up with.....