Pistol calibers must be shot at no less than 50 yards, rifle calibers at 100 yards. Your .223 will need to be shot at 100 yards.
You can use optics, and any kind of rest you want.
As posted above, this is a VERY informal match. The only hard and fast rules are the yardages, and that you can only enter H&R/NEF single shot break action rifles and slug guns.
We basically just like to do this to show what these "cheap" guns are capable of.
I also encourage you to check out the sticky post. It will have more info than I have posted here.
When you're ready to send in a card, shoot an email to wsc ott@ptsi.net (take out the space) and I'll get my mailing address to you.
Good luck.