Does anyone have any experience with adjusting magazine box lips to aid feeding. I have just "Acklyed" a rifle and am having problems feeding rounds from the box to the chamber because of the "fatter" profile of the Ackley round. I know that the lips can be adjusted to ease this problem but it is not something I want to do by trial and error without getting some pointers from someone who has done it first. Can anyone offer some advice please?