I believe you should be able to use any action gun you want. A more controlled second shot is more easy. The one thing that I could be a problem is more people using guns in smaller calibers, if they go with the most common caliber in semi autos today. A 223 will kill deer, but not as well as larger calibers, when shot placement is off. With all the calibers you can buy or make in a semi auto, this may not even be a factor. And nosler does make a decent partition bullet in .224. I believe I would be looking at a 7400, as I like 30-06. I now use a semi auto for some small game, it was just a matter of finding one that met my accuracy standards. As for safety, an unsafe person is a threat no matter what type action they use.