You may have 8X57JRS barrels. That makes for much easier reloading with more common .323 bullets. Slug the barrels. If they are .321 or bigger you can use regular S bore bullets of conventional design. Be sure to use the milder J bore loads, however. I have never liked the hotter JRS factory loading; it seems to loosen the guns up much faster. That extra 50 to 100 fps seems to be just that extra straw on the camel's back.