Until now I've followed strictly Gibson suggestions i.e. enlarged flash hole for "the load" and dacron filler for magnum pistol powder (H110, N110) from 18 to 25 grs. Now I'd like to load 21grs Vhitavuori N110 with the gas checked Lee CTL-312-160-2R bullet for the argentine 7,65x53 carbine just to have (Quickload) 1831fps at 21940 psi. The doubt is : may I enlarge flashole avoiding dacron filler?