I have a .308 Savage short action with DBM and i want to convert it to .223 with DBM. I know the bolt head/barrel must change. I plan to buy new .223 mags but will they fit the SA ? IS the .223 magazine opening the same size as the 308 with just the feed lips smaller for the smaller cartridge ? are there any 9 or 10 rd mags for .223 Savage yet ? help