According to Lyman's Cast Bullet Handbook 4th Edition, the starting load for IMR-4198 and a 180gr cast bullet is 18.0gr. Max load is 25.5gr.
Quick Load predicts the following.
[img]https://www.milsurps.com/images/imported/2015/07/76520QL_zpshvguyg***if-1.jpg[/img]