I'll just have to disagree with everybody, here's why.
The pressures really aren't that different. The
hottest load for the 410 in the Lyman Shotshell Reloading Handbook #4 is 11,600 LUP (lead units of pressure. Alliant hottest is 12,700 PSI. So we can
assume that the shotgun in question is capable of at least that pressure.
Now, I understand (but have not verified) that the standard pressure of a .45 Colt cartridge is around 10,000-12,000 with a max pressure of 15,000, so it's really not a HUGE difference.
With a Cylinder Bore Choke I
think it is possible to safely shoot a low pressure 45 Colt through a 410 barrel, heck I'd bet my next paycheck on it.
BUT, I would not bet my life on it.
So I would never do it and would strongly advise against it. But that doesn't mean it can't be done, to me it's one of those things that there's only one way to find out, and if it ends wrong..........well, it want be good.
A good rule of thumb is to look on the barrel and shoot what it says there.
EDIT:
If the pressures are wrong feel free to correct me, I did do a little reading up on this a while back but I am not a reloader so I only half understood what I was reading.