There are several things wrong with this and you should be able to talk yourself out of it even if someone says yes you can.
Ask yourself, will shooting a 45 Colt bullet down a smooth barrel be accurate at the distance you are wanting to shoot?
Take a .452 bullet and see if it fits in the end of your barrel.
Drop a .452 bullet down the barrel from the breech and see if it comes out the other end or gets stuck along the way.
Do you known that the barrel will handle the pressure?
If something goes wrong, is Stevens going to back you up on this?
Is there anything to gain over shooting a 410 slug designed for this application beside some cost savings?
I think you are asking for big trouble here and I would not attempt it.
You can shoot 410 out of a 45 long colt but not the other way around.
410 is a 41 caliber.
I doubt you will find any 45 Colt chambers long enough to chamber a 2.5 or 3" shell! Would extend well into the rifling. Exceptions are purpose made guns like the taurus judge and NEF handi rifle in 45/410.
You can shoot 410 2.5" out of 45-70 guns but why would you want to?