porthos
02-22-2014, 04:07 PM
just got back from ace hardware store. noticed in there nuts, bolts, screws ect. section; metric "o" rings. bought 15 of each. 10mm id. 13mm od. 1.5mm thick. didn't remember the size of the second size. but, the second size is 1 size smaller in the box with the selection. the second size (smaller might be the better choice. at .030 each i have plenty. when i fireform empty brass i intend to use the "o" ring and also bell the case mouth