Thanks for the info I just got a line on a L579 Colt Coltman in 308 that I really like ... so that may work out. It's pricey, but not unreasonable $1100, and the owner is interested in a piece that I have in my vault. so .......... I just need to make sure the bolt is compatible and to see an estimate for headspacing the cost of headspacing Thanks for the info , it definitely was helpful Mike