I know you need to use those round clips to fire ACP. But I guess I could use 45 Auto Rim brass. Is that true? Also, I was told a long time ago that the rifeling in ACP N Frames was more shallow then the other calibers. Is this true? I would want to shoot cast and if true would this be a problem? The one I am looking at on consignment has the Hillary hole. Any problem with the cylinder throats? Sorry for all the dumb questions. I have been an owner of many N Frames dating back to the 80's but not this caliber. I am not sure about it. I am thinking about this one instead of a 1911.