a few years ago i had a 30-30 marlin re bored and chambered for 38-55,,,i didn't have to change anything else on the gun
a smith in washington state did it for me,,(i think he is retired now),,,i stripped the action and sent the action and barrel to him,,seems as thought it was in the $200 range,,,this was along about 96-97
he did a great job,,and it was a shooter too,,,i finally got tired of hearing my bud whine about how he wanted it and sold it to him,,,and then i got one of the marlin factory guns they made a few year ago for a short while
i have had 3-of them in 38-55,,they are fun to play with,,,and generally a good shooter
ocharry