Sounds like a great shoot.

To keep things fair however, the Taylor knock out value can be calculated into the scoring process.
This encourages the use of SERIOUS cartridges and makes it harder for shooters using pussy cartridges to win.
Simply multiply the score by the knock out value.
Some friends in the NT top end have been doing this type of shoot for many years.

One other thing was that for the charging buffalo event, they often went out and got a real one!

Oops, sorry 450NE No2, I wasn't trying to suggest that you or your wife were using little cartridges to win!

Just saying that it makes the shoot even more fun by using the knock out value.
You can then have two prizes, one for highest on paper score and another when the knock out is factored in.