You should purchase a ported gasoline plug for an M1 Garand so that it can functionality with professional ammo, or it is possible to either obtain M2 ball (many manufacturers sell M2 ball spec ammo especially for the M1 Garand), or reload it. I think some manuals even have M2 https://federal-30-06-for-m1-gara30739.blogunteer.com/19863214/30-06-garand-ammo-difference-for-dummies