I recently aquired a RRA AR-15 in 458 SOCOM. My intent is to use it for primarily sub-sonic loads. I currently have the following molds: RCBS 45-300-FN, 45-405-FN and Lyman 457483 (385 gn). I will probably obtain a 500 grain or heavier mold as well.
Anyone have any sub-sonic loading data? A forum search has yielded mainly super sonic load data.