Three years of trying now with various cast bullets and can’t get any cast to cycle reliable in it without a random jam. The magazine was designed with too much extra space letting the base of the case to drop into the front of the magazine causing the bullet to kick up too high and jam into the the top of the barrel where it threads into the receiver. Poor design on Rugers end. I’m done fighting with this gun and poor design. I’ve tried three magazines in it now per Rugers recommendation...the only way it’s going to work properly is to redesign the magazine IMO. Here a link to where I’ve posted pics as I have trouble loading them on this sight. If your looking to buy a Ruger American 450BM to shoot cast your going to be pulling your hair out.
http://castboolits.gunloads.com/showthr ... r-and-cast