Don’t presume you need .460” diameter bullets. Slug your bore first to find your groove diameter. Then, do a “ pound cast” to find your throat diameter. ( do an on-line search for “pound cast”+ “throat”, Veral Smith from LBT molds started it). Try to match the lubed/sized bullet diameter to your throat.
Throats may or may not be same diameter of the groove diameter. Throats can be greater diameter, and that’s what you want to know.
Who knows, you may need a .461-462” diameter bullet. Get the measurements first of your bore, then may bullet selection decision.
You can get essentially a custom diameter cast bullet mold from Arsenal molds for a great price. They have standard molds, but will alter diameter for no charge. Great molds, and fantastic option. Or, work with LBT molds/ Vetal Smith.
https://www.artfulbullet.com/index.php?threads/article-2-how-i-make-pound-casts.131/
