For 36cal Navies I have a 15, a 20, and a 25gr spout. Using Pyro-P you could fill the entire chamber and ram a ball down onto it and it would likely clear the chamber mouth. Pyro-P is quite compressible when ramming a ball. . I also cast the LEE 130gr 36cal conical for my Colt & Remington Navies and it give them more oomph.